#ifdef HAVE_CONFIG_H #include #endif #include #include #include #include #ifdef HAVE_RSVG #include #endif #include "eom-config-keys.h" #include "eom-enum-types.h" #include "eom-marshal.h" #include "eom-scroll-view.h" #include "eom-debug.h" #include "zoom.h" #include /* Scroll step increment */ #define SCROLL_STEP_SIZE 32 /* Maximum zoom factor */ #define MAX_ZOOM_FACTOR 20 #define MIN_ZOOM_FACTOR 0.02 #define CHECK_MEDIUM 8 #define CHECK_BLACK "#000000" #define CHECK_GRAY "#808080" #define CHECK_LIGHT "#cccccc" /* Default increment for zooming. The current zoom factor is multiplied or * divided by this amount on every zooming step. For consistency, you should * use the same value elsewhere in the program. */ #define IMAGE_VIEW_ZOOM_MULTIPLIER 1.05 /* States for automatically adjusting the zoom factor */ typedef enum { ZOOM_MODE_FIT, /* Image is fitted to scroll view even if the latter changes size */ ZOOM_MODE_FREE /* The image remains at its current zoom factor even if the scrollview changes size */ } ZoomMode; /* Signal IDs */ enum { SIGNAL_ZOOM_CHANGED, SIGNAL_LAST }; static guint view_signals [SIGNAL_LAST] = { 0 }; typedef enum { EOM_SCROLL_VIEW_CURSOR_NORMAL, EOM_SCROLL_VIEW_CURSOR_HIDDEN, EOM_SCROLL_VIEW_CURSOR_DRAG } EomScrollViewCursor; /* Drag 'n Drop */ static GtkTargetEntry target_table[] = { { "text/uri-list", 0, 0}, }; enum { PROP_0, PROP_ANTIALIAS_IN, PROP_ANTIALIAS_OUT, PROP_BACKGROUND_COLOR, PROP_IMAGE, PROP_SCROLLWHEEL_ZOOM, PROP_TRANSP_COLOR, PROP_TRANSPARENCY_STYLE, PROP_USE_BG_COLOR, PROP_ZOOM_MULTIPLIER }; /* Private part of the EomScrollView structure */ struct _EomScrollViewPrivate { /* some widgets we rely on */ GtkWidget *display; GtkAdjustment *hadj; GtkAdjustment *vadj; GtkWidget *hbar; GtkWidget *vbar; GtkWidget *menu; /* actual image */ EomImage *image; gulong image_changed_id; gulong frame_changed_id; GdkPixbuf *pixbuf; cairo_surface_t *surface; /* scale factor */ gint scale; /* zoom mode, either ZOOM_MODE_FIT or ZOOM_MODE_FREE */ ZoomMode zoom_mode; /* whether to allow zoom > 1.0 on zoom fit */ gboolean upscale; /* the actual zoom factor */ double zoom; /* the minimum possible (reasonable) zoom factor */ double min_zoom; /* Current scrolling offsets */ int xofs, yofs; /* handler ID for paint idle callback */ guint idle_id; /* Interpolation type when zoomed in*/ cairo_filter_t interp_type_in; /* Interpolation type when zoomed out*/ cairo_filter_t interp_type_out; /* Scroll wheel zoom */ gboolean scroll_wheel_zoom; /* Scroll wheel zoom */ gdouble zoom_multiplier; /* dragging stuff */ int drag_anchor_x, drag_anchor_y; int drag_ofs_x, drag_ofs_y; guint dragging : 1; /* how to indicate transparency in images */ EomTransparencyStyle transp_style; GdkRGBA transp_color; /* the type of the cursor we are currently showing */ EomScrollViewCursor cursor; gboolean use_bg_color; GdkRGBA *background_color; GdkRGBA *override_bg_color; cairo_surface_t *background_surface; /* Two-pass filtering */ GSource *hq_redraw_timeout_source; gboolean force_unfiltered; }; static void scroll_by (EomScrollView *view, int xofs, int yofs); static void set_zoom_fit (EomScrollView *view); /* static void request_paint_area (EomScrollView *view, GdkRectangle *area); */ static void set_minimum_zoom_factor (EomScrollView *view); static void view_on_drag_begin_cb (GtkWidget *widget, GdkDragContext *context, gpointer user_data); static void view_on_drag_data_get_cb (GtkWidget *widget, GdkDragContext*drag_context, GtkSelectionData *data, guint info, guint time, gpointer user_data); static gboolean _eom_gdk_rgba_equal0 (const GdkRGBA *a, const GdkRGBA *b); G_DEFINE_TYPE_WITH_PRIVATE (EomScrollView, eom_scroll_view, GTK_TYPE_GRID) /*=================================== widget size changing handler & util functions ---------------------------------*/ static cairo_surface_t * create_surface_from_pixbuf (EomScrollView *view, GdkPixbuf *pixbuf) { cairo_surface_t *surface; surface = gdk_cairo_surface_create_from_pixbuf (pixbuf, view->priv->scale, gtk_widget_get_window (view->priv->display)); return surface; } /* Disconnects from the EomImage and removes references to it */ static void free_image_resources (EomScrollView *view) { EomScrollViewPrivate *priv; priv = view->priv; #if GLIB_CHECK_VERSION(2,62,0) g_clear_signal_handler (&priv->image_changed_id, priv->image); g_clear_signal_handler (&priv->frame_changed_id, priv->image); #else if (priv->image_changed_id != 0) { g_signal_handler_disconnect (priv->image, priv->image_changed_id); priv->image_changed_id = 0; } if (priv->frame_changed_id != 0) { g_signal_handler_disconnect (priv->image, priv->frame_changed_id); priv->frame_changed_id = 0; } #endif if (priv->image != NULL) { eom_image_data_unref (priv->image); priv->image = NULL; } if (priv->pixbuf != NULL) { g_object_unref (priv->pixbuf); priv->pixbuf = NULL; } if (priv->surface !=NULL) { cairo_surface_destroy (priv->surface); priv->surface = NULL; } } /* Computes the size in pixels of the scaled image */ static void compute_scaled_size (EomScrollView *view, double zoom, int *width, int *height) { EomScrollViewPrivate *priv; priv = view->priv; if (priv->pixbuf) { *width = floor (gdk_pixbuf_get_width (priv->pixbuf) / priv->scale * zoom + 0.5); *height = floor (gdk_pixbuf_get_height (priv->pixbuf) / priv->scale * zoom + 0.5); } else *width = *height = 0; } /* Computes the offsets for the new zoom value so that they keep the image * centered on the view. */ static void compute_center_zoom_offsets (EomScrollView *view, double old_zoom, double new_zoom, int width, int height, double zoom_x_anchor, double zoom_y_anchor, int *xofs, int *yofs) { EomScrollViewPrivate *priv; int old_scaled_width, old_scaled_height; int new_scaled_width, new_scaled_height; double view_cx, view_cy; priv = view->priv; compute_scaled_size (view, old_zoom, &old_scaled_width, &old_scaled_height); if (old_scaled_width < width) view_cx = (zoom_x_anchor * old_scaled_width) / old_zoom; else view_cx = (priv->xofs + zoom_x_anchor * width) / old_zoom; if (old_scaled_height < height) view_cy = (zoom_y_anchor * old_scaled_height) / old_zoom; else view_cy = (priv->yofs + zoom_y_anchor * height) / old_zoom; compute_scaled_size (view, new_zoom, &new_scaled_width, &new_scaled_height); if (new_scaled_width < width) *xofs = 0; else { *xofs = floor (view_cx * new_zoom - zoom_x_anchor * width + 0.5); if (*xofs < 0) *xofs = 0; } if (new_scaled_height < height) *yofs = 0; else { *yofs = floor (view_cy * new_zoom - zoom_y_anchor * height + 0.5); if (*yofs < 0) *yofs = 0; } } /* Sets the scrollbar values based on the current scrolling offset */ static void update_scrollbar_values (EomScrollView *view) { EomScrollViewPrivate *priv; int scaled_width, scaled_height; gdouble page_size,page_increment,step_increment; gdouble lower, upper; GtkAllocation allocation; priv = view->priv; if (!gtk_widget_get_visible (priv->hbar) && !gtk_widget_get_visible (priv->vbar)) return; compute_scaled_size (view, priv->zoom, &scaled_width, &scaled_height); gtk_widget_get_allocation (priv->display, &allocation); if (gtk_widget_get_visible (priv->hbar)) { /* Set scroll increments */ page_size = MIN (scaled_width, allocation.width); page_increment = allocation.width / 2; step_increment = SCROLL_STEP_SIZE; /* Set scroll bounds and new offsets */ lower = 0; upper = scaled_width; priv->xofs = CLAMP (priv->xofs, 0, upper - page_size); g_signal_handlers_block_matched ( priv->hadj, G_SIGNAL_MATCH_DATA, 0, 0, NULL, NULL, view); gtk_adjustment_configure (priv->hadj, priv->xofs, lower, upper, step_increment, page_increment, page_size); g_signal_handlers_unblock_matched ( priv->hadj, G_SIGNAL_MATCH_DATA, 0, 0, NULL, NULL, view); } if (gtk_widget_get_visible (priv->vbar)) { page_size = MIN (scaled_height, allocation.height); page_increment = allocation.height / 2; step_increment = SCROLL_STEP_SIZE; lower = 0; upper = scaled_height; priv->yofs = CLAMP (priv->yofs, 0, upper - page_size); g_signal_handlers_block_matched ( priv->vadj, G_SIGNAL_MATCH_DATA, 0, 0, NULL, NULL, view); gtk_adjustment_configure (priv->vadj, priv->yofs, lower, upper, step_increment, page_increment, page_size); g_signal_handlers_unblock_matched ( priv->vadj, G_SIGNAL_MATCH_DATA, 0, 0, NULL, NULL, view); } } static void eom_scroll_view_set_cursor (EomScrollView *view, EomScrollViewCursor new_cursor) { GdkCursor *cursor = NULL; GdkDisplay *display; GtkWidget *widget; if (view->priv->cursor == new_cursor) { return; } widget = gtk_widget_get_toplevel (GTK_WIDGET (view)); display = gtk_widget_get_display (widget); view->priv->cursor = new_cursor; switch (new_cursor) { case EOM_SCROLL_VIEW_CURSOR_NORMAL: gdk_window_set_cursor (gtk_widget_get_window (widget), NULL); break; case EOM_SCROLL_VIEW_CURSOR_HIDDEN: cursor = gdk_cursor_new_for_display (display, GDK_BLANK_CURSOR); break; case EOM_SCROLL_VIEW_CURSOR_DRAG: cursor = gdk_cursor_new_for_display (display, GDK_FLEUR); break; } if (cursor) { gdk_window_set_cursor (gtk_widget_get_window (widget), cursor); g_object_unref (cursor); gdk_display_flush (display); } } /* Changes visibility of the scrollbars based on the zoom factor and the * specified allocation, or the current allocation if NULL is specified. */ static void check_scrollbar_visibility (EomScrollView *view, GtkAllocation *alloc) { EomScrollViewPrivate *priv; int bar_height; int bar_width; int img_width; int img_height; GtkRequisition req; int width, height; gboolean hbar_visible, vbar_visible; priv = view->priv; if (alloc) { width = alloc->width; height = alloc->height; } else { GtkAllocation allocation; gtk_widget_get_allocation (GTK_WIDGET (view), &allocation); width = allocation.width; height = allocation.height; } compute_scaled_size (view, priv->zoom, &img_width, &img_height); /* this should work fairly well in this special case for scrollbars */ gtk_widget_get_preferred_size (priv->hbar, &req, NULL); bar_height = req.height; gtk_widget_get_preferred_size (priv->vbar, &req, NULL); bar_width = req.width; eom_debug_message (DEBUG_WINDOW, "Widget Size allocate: %i, %i Bar: %i, %i\n", width, height, bar_width, bar_height); hbar_visible = vbar_visible = FALSE; if (priv->zoom_mode == ZOOM_MODE_FIT) hbar_visible = vbar_visible = FALSE; else if (img_width <= width && img_height <= height) hbar_visible = vbar_visible = FALSE; else if (img_width > width && img_height > height) hbar_visible = vbar_visible = TRUE; else if (img_width > width) { hbar_visible = TRUE; if (img_height <= (height - bar_height)) vbar_visible = FALSE; else vbar_visible = TRUE; } else if (img_height > height) { vbar_visible = TRUE; if (img_width <= (width - bar_width)) hbar_visible = FALSE; else hbar_visible = TRUE; } if (hbar_visible != gtk_widget_get_visible (priv->hbar)) g_object_set (G_OBJECT (priv->hbar), "visible", hbar_visible, NULL); if (vbar_visible != gtk_widget_get_visible (priv->vbar)) g_object_set (G_OBJECT (priv->vbar), "visible", vbar_visible, NULL); } #define DOUBLE_EQUAL_MAX_DIFF 1e-6 #define DOUBLE_EQUAL(a,b) (fabs (a - b) < DOUBLE_EQUAL_MAX_DIFF) /* Returns whether the image is zoomed in */ static gboolean is_zoomed_in (EomScrollView *view) { EomScrollViewPrivate *priv; priv = view->priv; return priv->zoom - 1.0 > DOUBLE_EQUAL_MAX_DIFF; } /* Returns whether the image is zoomed out */ static gboolean is_zoomed_out (EomScrollView *view) { EomScrollViewPrivate *priv; priv = view->priv; return DOUBLE_EQUAL_MAX_DIFF + priv->zoom - 1.0 < 0.0; } /* Returns wether the image is movable, that means if it is larger then * the actual visible area. */ static gboolean is_image_movable (EomScrollView *view) { EomScrollViewPrivate *priv; priv = view->priv; return (gtk_widget_get_visible (priv->hbar) || gtk_widget_get_visible (priv->vbar)); } /*=================================== drawing core ---------------------------------*/ static void get_transparency_params (EomScrollView *view, int *size, GdkRGBA *color1, GdkRGBA *color2) { EomScrollViewPrivate *priv; priv = view->priv; /* Compute transparency parameters */ switch (priv->transp_style) { case EOM_TRANSP_BACKGROUND: { /* Simply return fully transparent color */ color1->red = color1->green = color1->blue = color1->alpha = 0.0; color2->red = color2->green = color2->blue = color2->alpha = 0.0; break; } case EOM_TRANSP_CHECKED: g_warn_if_fail (gdk_rgba_parse (color1, CHECK_GRAY)); g_warn_if_fail (gdk_rgba_parse (color2, CHECK_LIGHT)); break; case EOM_TRANSP_COLOR: *color1 = *color2 = priv->transp_color; break; default: g_assert_not_reached (); }; *size = CHECK_MEDIUM; } static cairo_surface_t * create_background_surface (EomScrollView *view) { int check_size; GdkRGBA check_1; GdkRGBA check_2; cairo_surface_t *surface; get_transparency_params (view, &check_size, &check_1, &check_2); surface = gdk_window_create_similar_surface (gtk_widget_get_window (view->priv->display), CAIRO_CONTENT_COLOR_ALPHA, check_size * 2, check_size * 2); cairo_t* cr = cairo_create (surface); /* Use source operator to make fully transparent work */ cairo_set_operator (cr, CAIRO_OPERATOR_SOURCE); gdk_cairo_set_source_rgba(cr, &check_1); cairo_rectangle (cr, 0, 0, check_size, check_size); cairo_rectangle (cr, check_size, check_size, check_size, check_size); cairo_fill (cr); gdk_cairo_set_source_rgba(cr, &check_2); cairo_rectangle (cr, 0, check_size, check_size, check_size); cairo_rectangle (cr, check_size, 0, check_size, check_size); cairo_fill (cr); cairo_destroy (cr); return surface; } /* ======================================= scrolling stuff --------------------------------------*/ /* Scrolls the view to the specified offsets. */ static void scroll_to (EomScrollView *view, int x, int y, gboolean change_adjustments) { EomScrollViewPrivate *priv; GtkAllocation allocation; int xofs, yofs; GdkWindow *window; priv = view->priv; /* Check bounds & Compute offsets */ if (gtk_widget_get_visible (priv->hbar)) { x = CLAMP (x, 0, gtk_adjustment_get_upper (priv->hadj) - gtk_adjustment_get_page_size (priv->hadj)); xofs = x - priv->xofs; } else xofs = 0; if (gtk_widget_get_visible (priv->vbar)) { y = CLAMP (y, 0, gtk_adjustment_get_upper (priv->vadj) - gtk_adjustment_get_page_size (priv->vadj)); yofs = y - priv->yofs; } else yofs = 0; if (xofs == 0 && yofs == 0) return; priv->xofs = x; priv->yofs = y; if (!gtk_widget_is_drawable (priv->display)) goto out; gtk_widget_get_allocation (priv->display, &allocation); if (abs (xofs) >= allocation.width || abs (yofs) >= allocation.height) { gtk_widget_queue_draw (priv->display); goto out; } window = gtk_widget_get_window (priv->display); gdk_window_scroll (window, -xofs, -yofs); out: if (!change_adjustments) return; g_signal_handlers_block_matched ( priv->hadj, G_SIGNAL_MATCH_DATA, 0, 0, NULL, NULL, view); g_signal_handlers_block_matched ( priv->vadj, G_SIGNAL_MATCH_DATA, 0, 0, NULL, NULL, view); gtk_adjustment_set_value (priv->hadj, x); gtk_adjustment_set_value (priv->vadj, y); g_signal_handlers_unblock_matched ( priv->hadj, G_SIGNAL_MATCH_DATA, 0, 0, NULL, NULL, view); g_signal_handlers_unblock_matched ( priv->vadj, G_SIGNAL_MATCH_DATA, 0, 0, NULL, NULL, view); } /* Scrolls the image view by the specified offsets. Notifies the adjustments * about their new values. */ static void scroll_by (EomScrollView *view, int xofs, int yofs) { EomScrollViewPrivate *priv; priv = view->priv; scroll_to (view, priv->xofs + xofs, priv->yofs + yofs, TRUE); } /* Callback used when an adjustment is changed */ static void adjustment_changed_cb (GtkAdjustment *adj, gpointer data) { EomScrollView *view; EomScrollViewPrivate *priv; view = EOM_SCROLL_VIEW (data); priv = view->priv; scroll_to (view, gtk_adjustment_get_value (priv->hadj), gtk_adjustment_get_value (priv->vadj), FALSE); gtk_widget_queue_resize (GTK_WIDGET (view)); } /* Drags the image to the specified position */ static void drag_to (EomScrollView *view, int x, int y) { EomScrollViewPrivate *priv; int dx, dy; priv = view->priv; dx = priv->drag_anchor_x - x; dy = priv->drag_anchor_y - y; x = priv->drag_ofs_x + dx; y = priv->drag_ofs_y + dy; scroll_to (view, x, y, TRUE); } static void set_minimum_zoom_factor (EomScrollView *view) { g_return_if_fail (EOM_IS_SCROLL_VIEW (view)); view->priv->min_zoom = MAX (1.0 / gdk_pixbuf_get_width (view->priv->pixbuf) / view->priv->scale, MAX(1.0 / gdk_pixbuf_get_height (view->priv->pixbuf) / view->priv->scale, MIN_ZOOM_FACTOR) ); return; } /** * set_zoom: * @view: A scroll view. * @zoom: Zoom factor. * @have_anchor: Whether the anchor point specified by (@anchorx, @anchory) * should be used. * @anchorx: Horizontal anchor point in pixels. * @anchory: Vertical anchor point in pixels. * * Sets the zoom factor for an image view. The anchor point can be used to * specify the point that stays fixed when the image is zoomed. If @have_anchor * is %TRUE, then (@anchorx, @anchory) specify the point relative to the image * view widget's allocation that will stay fixed when zooming. If @have_anchor * is %FALSE, then the center point of the image view will be used. **/ static void set_zoom (EomScrollView *view, double zoom, gboolean have_anchor, int anchorx, int anchory) { EomScrollViewPrivate *priv; GtkAllocation allocation; int xofs, yofs; double x_rel, y_rel; priv = view->priv; if (priv->pixbuf == NULL) return; if (zoom > MAX_ZOOM_FACTOR) zoom = MAX_ZOOM_FACTOR; else if (zoom < MIN_ZOOM_FACTOR) zoom = MIN_ZOOM_FACTOR; if (DOUBLE_EQUAL (priv->zoom, zoom)) return; if (DOUBLE_EQUAL (priv->zoom, priv->min_zoom) && zoom < priv->zoom) return; priv->zoom_mode = ZOOM_MODE_FREE; gtk_widget_get_allocation (priv->display, &allocation); /* compute new xofs/yofs values */ if (have_anchor) { x_rel = (double) anchorx / allocation.width; y_rel = (double) anchory / allocation.height; } else { x_rel = 0.5; y_rel = 0.5; } compute_center_zoom_offsets (view, priv->zoom, zoom, allocation.width, allocation.height, x_rel, y_rel, &xofs, &yofs); /* set new values */ priv->xofs = xofs; /* (img_width * x_rel * zoom) - anchorx; */ priv->yofs = yofs; /* (img_height * y_rel * zoom) - anchory; */ #if 0 g_print ("xofs: %i yofs: %i\n", priv->xofs, priv->yofs); #endif if (zoom <= priv->min_zoom) priv->zoom = priv->min_zoom; else priv->zoom = zoom; /* we make use of the new values here */ check_scrollbar_visibility (view, NULL); update_scrollbar_values (view); /* repaint the whole image */ gtk_widget_queue_draw (priv->display); g_signal_emit (view, view_signals[SIGNAL_ZOOM_CHANGED], 0, priv->zoom); } /* Zooms the image to fit the available allocation */ static void set_zoom_fit (EomScrollView *view) { EomScrollViewPrivate *priv; GtkAllocation allocation; double new_zoom; priv = view->priv; priv->zoom_mode = ZOOM_MODE_FIT; if (!gtk_widget_get_mapped (GTK_WIDGET (view))) return; if (priv->pixbuf == NULL) return; gtk_widget_get_allocation (priv->display, &allocation); new_zoom = zoom_fit_scale (allocation.width, allocation.height, gdk_pixbuf_get_width (priv->pixbuf) / priv->scale, gdk_pixbuf_get_height (priv->pixbuf) / priv->scale, priv->upscale); if (new_zoom > MAX_ZOOM_FACTOR) new_zoom = MAX_ZOOM_FACTOR; else if (new_zoom < MIN_ZOOM_FACTOR) new_zoom = MIN_ZOOM_FACTOR; priv->zoom = new_zoom; priv->xofs = 0; priv->yofs = 0; g_signal_emit (view, view_signals[SIGNAL_ZOOM_CHANGED], 0, priv->zoom); } /*=================================== internal signal callbacks ---------------------------------*/ /* Key press event handler for the image view */ static gboolean display_key_press_event (GtkWidget *widget, GdkEventKey *event, gpointer data) { EomScrollView *view; EomScrollViewPrivate *priv; GtkAllocation allocation; gboolean do_zoom; double zoom; gboolean do_scroll; int xofs, yofs; view = EOM_SCROLL_VIEW (data); priv = view->priv; do_zoom = FALSE; do_scroll = FALSE; xofs = yofs = 0; zoom = 1.0; gtk_widget_get_allocation (priv->display, &allocation); /* EomScrollView doesn't handle/have any Alt+Key combos */ if (event->state & GDK_MOD1_MASK) { return FALSE; } switch (event->keyval) { case GDK_KEY_Up: do_scroll = TRUE; xofs = 0; yofs = -SCROLL_STEP_SIZE; break; case GDK_KEY_Page_Up: do_scroll = TRUE; if (event->state & GDK_CONTROL_MASK) { xofs = -(allocation.width * 3) / 4; yofs = 0; } else { xofs = 0; yofs = -(allocation.height * 3) / 4; } break; case GDK_KEY_Down: do_scroll = TRUE; xofs = 0; yofs = SCROLL_STEP_SIZE; break; case GDK_KEY_Page_Down: do_scroll = TRUE; if (event->state & GDK_CONTROL_MASK) { xofs = (allocation.width * 3) / 4; yofs = 0; } else { xofs = 0; yofs = (allocation.height * 3) / 4; } break; case GDK_KEY_Left: do_scroll = TRUE; xofs = -SCROLL_STEP_SIZE; yofs = 0; break; case GDK_KEY_Right: do_scroll = TRUE; xofs = SCROLL_STEP_SIZE; yofs = 0; break; case GDK_KEY_plus: case GDK_KEY_equal: case GDK_KEY_KP_Add: do_zoom = TRUE; zoom = priv->zoom * priv->zoom_multiplier; break; case GDK_KEY_minus: case GDK_KEY_KP_Subtract: do_zoom = TRUE; zoom = priv->zoom / priv->zoom_multiplier; break; case GDK_KEY_1: do_zoom = TRUE; zoom = 1.0; break; default: return FALSE; } if (do_zoom) { GdkSeat *seat; GdkDevice *device; gint x, y; seat = gdk_display_get_default_seat (gtk_widget_get_display (widget)); device = gdk_seat_get_pointer (seat); gdk_window_get_device_position (gtk_widget_get_window (widget), device, &x, &y, NULL); set_zoom (view, zoom, TRUE, x, y); } if (do_scroll) scroll_by (view, xofs, yofs); return TRUE; } /* Button press event handler for the image view */ static gboolean eom_scroll_view_button_press_event (GtkWidget *widget, GdkEventButton *event, gpointer data) { EomScrollView *view; EomScrollViewPrivate *priv; view = EOM_SCROLL_VIEW (data); priv = view->priv; if (!gtk_widget_has_focus (priv->display)) gtk_widget_grab_focus (priv->display); if (priv->dragging) return FALSE; switch (event->button) { case 1: case 2: if (event->button == 1 && !priv->scroll_wheel_zoom && !(event->state & GDK_CONTROL_MASK)) break; if (is_image_movable (view)) { eom_scroll_view_set_cursor (view, EOM_SCROLL_VIEW_CURSOR_DRAG); priv->dragging = TRUE; priv->drag_anchor_x = event->x; priv->drag_anchor_y = event->y; priv->drag_ofs_x = priv->xofs; priv->drag_ofs_y = priv->yofs; return TRUE; } default: break; } return FALSE; } /* Button release event handler for the image view */ static gboolean eom_scroll_view_button_release_event (GtkWidget *widget, GdkEventButton *event, gpointer data) { EomScrollView *view; EomScrollViewPrivate *priv; view = EOM_SCROLL_VIEW (data); priv = view->priv; if (!priv->dragging) return FALSE; switch (event->button) { case 1: case 2: drag_to (view, event->x, event->y); priv->dragging = FALSE; eom_scroll_view_set_cursor (view, EOM_SCROLL_VIEW_CURSOR_NORMAL); break; default: break; } return TRUE; } /* Scroll event handler for the image view. We zoom with an event without * modifiers rather than scroll; we use the Shift modifier to scroll. * Rationale: images are not primarily vertical, and in EOM you scan scroll by * dragging the image with button 1 anyways. */ static gboolean eom_scroll_view_scroll_event (GtkWidget *widget, GdkEventScroll *event, gpointer data) { EomScrollView *view; EomScrollViewPrivate *priv; double zoom_factor; int xofs, yofs; view = EOM_SCROLL_VIEW (data); priv = view->priv; /* Compute zoom factor and scrolling offsets; we'll only use either of them */ /* same as in gtkscrolledwindow.c */ xofs = gtk_adjustment_get_page_increment (priv->hadj) / 2; yofs = gtk_adjustment_get_page_increment (priv->vadj) / 2; switch (event->direction) { case GDK_SCROLL_UP: zoom_factor = priv->zoom_multiplier; xofs = 0; yofs = -yofs; break; case GDK_SCROLL_LEFT: zoom_factor = 1.0 / priv->zoom_multiplier; xofs = -xofs; yofs = 0; break; case GDK_SCROLL_DOWN: zoom_factor = 1.0 / priv->zoom_multiplier; xofs = 0; yofs = yofs; break; case GDK_SCROLL_RIGHT: zoom_factor = priv->zoom_multiplier; xofs = xofs; yofs = 0; break; default: g_assert_not_reached (); return FALSE; } if (priv->scroll_wheel_zoom) { if (event->state & GDK_SHIFT_MASK) scroll_by (view, yofs, xofs); else if (event->state & GDK_CONTROL_MASK) scroll_by (view, xofs, yofs); else set_zoom (view, priv->zoom * zoom_factor, TRUE, event->x, event->y); } else { if (event->state & GDK_SHIFT_MASK) scroll_by (view, yofs, xofs); else if (event->state & GDK_CONTROL_MASK) set_zoom (view, priv->zoom * zoom_factor, TRUE, event->x, event->y); else scroll_by (view, xofs, yofs); } return TRUE; } /* Motion event handler for the image view */ static gboolean eom_scroll_view_motion_event (GtkWidget *widget, GdkEventMotion *event, gpointer data) { EomScrollView *view; EomScrollViewPrivate *priv; gint x, y; GdkModifierType mods; view = EOM_SCROLL_VIEW (data); priv = view->priv; if (!priv->dragging) return FALSE; if (event->is_hint) gdk_window_get_device_position (gtk_widget_get_window (priv->display), event->device, &x, &y, &mods); else { x = event->x; y = event->y; } drag_to (view, x, y); return TRUE; } static void display_map_event (GtkWidget *widget, GdkEvent *event, gpointer data) { EomScrollView *view; EomScrollViewPrivate *priv; view = EOM_SCROLL_VIEW (data); priv = view->priv; eom_debug (DEBUG_WINDOW); set_zoom_fit (view); check_scrollbar_visibility (view, NULL); gtk_widget_queue_draw (priv->display); } static void eom_scroll_view_size_allocate (GtkWidget *widget, GtkAllocation *alloc) { EomScrollView *view; view = EOM_SCROLL_VIEW (widget); check_scrollbar_visibility (view, alloc); GTK_WIDGET_CLASS (eom_scroll_view_parent_class)->size_allocate (widget ,alloc); } static void display_size_change (GtkWidget *widget, GdkEventConfigure *event, gpointer data) { EomScrollView *view; EomScrollViewPrivate *priv; view = EOM_SCROLL_VIEW (data); priv = view->priv; if (priv->zoom_mode == ZOOM_MODE_FIT) { GtkAllocation alloc; alloc.width = event->width; alloc.height = event->height; set_zoom_fit (view); check_scrollbar_visibility (view, &alloc); gtk_widget_queue_draw (priv->display); } else { int scaled_width, scaled_height; int x_offset = 0; int y_offset = 0; compute_scaled_size (view, priv->zoom, &scaled_width, &scaled_height); if (priv->xofs + event->width > scaled_width) x_offset = scaled_width - event->width - priv->xofs; if (priv->yofs + event->height > scaled_height) y_offset = scaled_height - event->height - priv->yofs; scroll_by (view, x_offset, y_offset); } update_scrollbar_values (view); } static gboolean eom_scroll_view_focus_in_event (GtkWidget *widget, GdkEventFocus *event, gpointer data) { g_signal_stop_emission_by_name (widget, "focus_in_event"); return FALSE; } static gboolean eom_scroll_view_focus_out_event (GtkWidget *widget, GdkEventFocus *event, gpointer data) { g_signal_stop_emission_by_name (widget, "focus_out_event"); return FALSE; } static gboolean _hq_redraw_cb (gpointer user_data) { EomScrollViewPrivate *priv = EOM_SCROLL_VIEW (user_data)->priv; priv->force_unfiltered = FALSE; gtk_widget_queue_draw (priv->display); priv->hq_redraw_timeout_source = NULL; return G_SOURCE_REMOVE; } static void _clear_hq_redraw_timeout (EomScrollView *view) { EomScrollViewPrivate *priv = view->priv; if (priv->hq_redraw_timeout_source != NULL) { g_source_unref (priv->hq_redraw_timeout_source); g_source_destroy (priv->hq_redraw_timeout_source); } priv->hq_redraw_timeout_source = NULL; } static void _set_hq_redraw_timeout (EomScrollView *view) { GSource *source; _clear_hq_redraw_timeout (view); source = g_timeout_source_new (200); g_source_set_callback (source, &_hq_redraw_cb, view, NULL); g_source_attach (source, NULL); view->priv->hq_redraw_timeout_source = source; } static gboolean display_draw (GtkWidget *widget, cairo_t *cr, gpointer data) { const GdkRGBA *background_color = NULL; EomScrollView *view; EomScrollViewPrivate *priv; GtkAllocation allocation; int scaled_width, scaled_height; int xofs, yofs; g_return_val_if_fail (GTK_IS_DRAWING_AREA (widget), FALSE); g_return_val_if_fail (EOM_IS_SCROLL_VIEW (data), FALSE); view = EOM_SCROLL_VIEW (data); priv = view->priv; if (priv->pixbuf == NULL) return TRUE; compute_scaled_size (view, priv->zoom, &scaled_width, &scaled_height); gtk_widget_get_allocation (priv->display, &allocation); /* Compute image offsets with respect to the window */ if (scaled_width <= allocation.width) xofs = (allocation.width - scaled_width) / 2; else xofs = -priv->xofs; if (scaled_height <= allocation.height) yofs = (allocation.height - scaled_height) / 2; else yofs = -priv->yofs; eom_debug_message (DEBUG_WINDOW, "zoom %.2f, xofs: %i, yofs: %i scaled w: %i h: %i\n", priv->zoom, xofs, yofs, scaled_width, scaled_height); /* Paint the background */ cairo_rectangle (cr, 0, 0, allocation.width, allocation.height); if (priv->transp_style != EOM_TRANSP_BACKGROUND) cairo_rectangle (cr, MAX (0, xofs), MAX (0, yofs), scaled_width, scaled_height); if (priv->override_bg_color != NULL) background_color = priv->override_bg_color; else if (priv->use_bg_color) background_color = priv->background_color; if (background_color != NULL) cairo_set_source_rgba (cr, background_color->red, background_color->green, background_color->blue, background_color->alpha); else cairo_set_source (cr, gdk_window_get_background_pattern (gtk_widget_get_window (priv->display))); cairo_set_fill_rule (cr, CAIRO_FILL_RULE_EVEN_ODD); cairo_fill (cr); if (gdk_pixbuf_get_has_alpha (priv->pixbuf)) { if (priv->background_surface == NULL) { priv->background_surface = create_background_surface (view); } cairo_set_source_surface (cr, priv->background_surface, xofs, yofs); cairo_pattern_set_extend (cairo_get_source (cr), CAIRO_EXTEND_REPEAT); cairo_rectangle (cr, xofs, yofs, scaled_width, scaled_height); cairo_fill (cr); } /* Make sure the image is only drawn as large as needed. * This is especially necessary for SVGs where there might * be more image data available outside the image boundaries. */ cairo_rectangle (cr, xofs, yofs, scaled_width, scaled_height); cairo_clip (cr); #ifdef HAVE_RSVG if (eom_image_is_svg (view->priv->image)) { cairo_matrix_t matrix, translate, scale, original; EomTransform *transform = eom_image_get_transform (priv->image); cairo_matrix_init_identity (&matrix); if (transform) { cairo_matrix_t affine; int image_offset_x = 0; int image_offset_y = 0; eom_transform_get_affine (transform, &affine); cairo_matrix_multiply (&matrix, &affine, &matrix); switch (eom_transform_get_transform_type (transform)) { case EOM_TRANSFORM_ROT_90: case EOM_TRANSFORM_FLIP_HORIZONTAL: image_offset_x = gdk_pixbuf_get_width (priv->pixbuf); break; case EOM_TRANSFORM_ROT_270: case EOM_TRANSFORM_FLIP_VERTICAL: image_offset_y = gdk_pixbuf_get_height (priv->pixbuf); break; case EOM_TRANSFORM_ROT_180: case EOM_TRANSFORM_TRANSPOSE: case EOM_TRANSFORM_TRANSVERSE: image_offset_x = gdk_pixbuf_get_width (priv->pixbuf); image_offset_y = gdk_pixbuf_get_height (priv->pixbuf); break; case EOM_TRANSFORM_NONE: default: break; } cairo_matrix_init_translate (&translate, (double) image_offset_x, (double) image_offset_y); cairo_matrix_multiply (&matrix, &matrix, &translate); } /* Zoom factor for SVGs is already scaled, so scale back to application pixels. */ cairo_matrix_init_scale (&scale, priv->zoom / priv->scale, priv->zoom / priv->scale); cairo_matrix_multiply (&matrix, &matrix, &scale); cairo_matrix_init_translate (&translate, xofs, yofs); cairo_matrix_multiply (&matrix, &matrix, &translate); cairo_get_matrix (cr, &original); cairo_matrix_multiply (&matrix, &matrix, &original); cairo_set_matrix (cr, &matrix); rsvg_handle_render_cairo (eom_image_get_svg (priv->image), cr); } else #endif /* HAVE_RSVG */ { cairo_filter_t interp_type; if(!DOUBLE_EQUAL(priv->zoom, 1.0) && priv->force_unfiltered) { interp_type = CAIRO_FILTER_NEAREST; _set_hq_redraw_timeout(view); } else { if (is_zoomed_in (view)) interp_type = priv->interp_type_in; else interp_type = priv->interp_type_out; _clear_hq_redraw_timeout (view); priv->force_unfiltered = TRUE; } cairo_scale (cr, priv->zoom, priv->zoom); cairo_set_source_surface (cr, priv->surface, xofs/priv->zoom, yofs/priv->zoom); cairo_pattern_set_extend (cairo_get_source (cr), CAIRO_EXTEND_PAD); if (is_zoomed_in (view) || is_zoomed_out (view)) cairo_pattern_set_filter (cairo_get_source (cr), interp_type); cairo_paint (cr); } return TRUE; } /*================================== image loading callbacks -----------------------------------*/ /* Use when the pixbuf in the view is changed, to keep a reference to it and create its cairo surface. */ static void update_pixbuf (EomScrollView *view, GdkPixbuf *pixbuf) { EomScrollViewPrivate *priv; priv = view->priv; if (priv->pixbuf != NULL) { g_object_unref (priv->pixbuf); priv->pixbuf = NULL; } priv->pixbuf = pixbuf; if (priv->surface) { cairo_surface_destroy (priv->surface); } priv->surface = create_surface_from_pixbuf (view, priv->pixbuf); } static void image_changed_cb (EomImage *img, gpointer data) { EomScrollViewPrivate *priv; priv = EOM_SCROLL_VIEW (data)->priv; update_pixbuf (EOM_SCROLL_VIEW (data), eom_image_get_pixbuf (img)); set_zoom_fit (EOM_SCROLL_VIEW (data)); check_scrollbar_visibility (EOM_SCROLL_VIEW (data), NULL); gtk_widget_queue_draw (priv->display); } /*=================================== public API ---------------------------------*/ void eom_scroll_view_hide_cursor (EomScrollView *view) { eom_scroll_view_set_cursor (view, EOM_SCROLL_VIEW_CURSOR_HIDDEN); } void eom_scroll_view_show_cursor (EomScrollView *view) { eom_scroll_view_set_cursor (view, EOM_SCROLL_VIEW_CURSOR_NORMAL); } /* general properties */ void eom_scroll_view_set_zoom_upscale (EomScrollView *view, gboolean upscale) { EomScrollViewPrivate *priv; g_return_if_fail (EOM_IS_SCROLL_VIEW (view)); priv = view->priv; if (priv->upscale != upscale) { priv->upscale = upscale; if (priv->zoom_mode == ZOOM_MODE_FIT) { set_zoom_fit (view); gtk_widget_queue_draw (priv->display); } } } void eom_scroll_view_set_antialiasing_in (EomScrollView *view, gboolean state) { EomScrollViewPrivate *priv; cairo_filter_t new_interp_type; g_return_if_fail (EOM_IS_SCROLL_VIEW (view)); priv = view->priv; new_interp_type = state ? CAIRO_FILTER_GOOD : CAIRO_FILTER_NEAREST; if (priv->interp_type_in != new_interp_type) { priv->interp_type_in = new_interp_type; gtk_widget_queue_draw (priv->display); g_object_notify (G_OBJECT (view), "antialiasing-in"); } } void eom_scroll_view_set_antialiasing_out (EomScrollView *view, gboolean state) { EomScrollViewPrivate *priv; cairo_filter_t new_interp_type; g_return_if_fail (EOM_IS_SCROLL_VIEW (view)); priv = view->priv; new_interp_type = state ? CAIRO_FILTER_GOOD : CAIRO_FILTER_NEAREST; if (priv->interp_type_out != new_interp_type) { priv->interp_type_out = new_interp_type; gtk_widget_queue_draw (priv->display); g_object_notify (G_OBJECT (view), "antialiasing-out"); } } static void _transp_background_changed (EomScrollView *view) { EomScrollViewPrivate *priv = view->priv; if (priv->pixbuf != NULL && gdk_pixbuf_get_has_alpha (priv->pixbuf)) { if (priv->background_surface) { cairo_surface_destroy (priv->background_surface); /* Will be recreated if needed during redraw */ priv->background_surface = NULL; } gtk_widget_queue_draw (priv->display); } } void eom_scroll_view_set_transparency_color (EomScrollView *view, GdkRGBA *color) { EomScrollViewPrivate *priv; g_return_if_fail (EOM_IS_SCROLL_VIEW (view)); priv = view->priv; if (!_eom_gdk_rgba_equal0 (&priv->transp_color, color)) { priv->transp_color = *color; if (priv->transp_style == EOM_TRANSP_COLOR) _transp_background_changed (view); g_object_notify (G_OBJECT (view), "transparency-color"); } } void eom_scroll_view_set_transparency (EomScrollView *view, EomTransparencyStyle style) { EomScrollViewPrivate *priv; g_return_if_fail (EOM_IS_SCROLL_VIEW (view)); priv = view->priv; if (priv->transp_style != style) { priv->transp_style = style; _transp_background_changed (view); g_object_notify (G_OBJECT (view), "transparency-style"); } } /* zoom api */ static double preferred_zoom_levels[] = { 1.0 / 100, 1.0 / 50, 1.0 / 20, 1.0 / 10.0, 1.0 / 5.0, 1.0 / 3.0, 1.0 / 2.0, 1.0 / 1.5, 1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0, 9.0, 10.0, 11.0, 12.0, 13.0, 14.0, 15.0, 16.0, 17.0, 18.0, 19.0, 20.0 }; static const gint n_zoom_levels = (sizeof (preferred_zoom_levels) / sizeof (double)); void eom_scroll_view_zoom_in (EomScrollView *view, gboolean smooth) { EomScrollViewPrivate *priv; double zoom; g_return_if_fail (EOM_IS_SCROLL_VIEW (view)); priv = view->priv; if (smooth) { zoom = priv->zoom * priv->zoom_multiplier; } else { int i; int index = -1; for (i = 0; i < n_zoom_levels; i++) { if (preferred_zoom_levels [i] - priv->zoom > DOUBLE_EQUAL_MAX_DIFF) { index = i; break; } } if (index == -1) { zoom = priv->zoom; } else { zoom = preferred_zoom_levels [i]; } } set_zoom (view, zoom, FALSE, 0, 0); } void eom_scroll_view_zoom_out (EomScrollView *view, gboolean smooth) { EomScrollViewPrivate *priv; double zoom; g_return_if_fail (EOM_IS_SCROLL_VIEW (view)); priv = view->priv; if (smooth) { zoom = priv->zoom / priv->zoom_multiplier; } else { int i; int index = -1; for (i = n_zoom_levels - 1; i >= 0; i--) { if (priv->zoom - preferred_zoom_levels [i] > DOUBLE_EQUAL_MAX_DIFF) { index = i; break; } } if (index == -1) { zoom = priv->zoom; } else { zoom = preferred_zoom_levels [i]; } } set_zoom (view, zoom, FALSE, 0, 0); } void eom_scroll_view_zoom_fit (EomScrollView *view) { g_return_if_fail (EOM_IS_SCROLL_VIEW (view)); set_zoom_fit (view); check_scrollbar_visibility (view, NULL); gtk_widget_queue_draw (view->priv->display); } void eom_scroll_view_set_zoom (EomScrollView *view, double zoom) { g_return_if_fail (EOM_IS_SCROLL_VIEW (view)); set_zoom (view, zoom, FALSE, 0, 0); } double eom_scroll_view_get_zoom (EomScrollView *view) { g_return_val_if_fail (EOM_IS_SCROLL_VIEW (view), 0.0); return view->priv->zoom; } gboolean eom_scroll_view_get_zoom_is_min (EomScrollView *view) { g_return_val_if_fail (EOM_IS_SCROLL_VIEW (view), FALSE); set_minimum_zoom_factor (view); return DOUBLE_EQUAL (view->priv->zoom, MIN_ZOOM_FACTOR) || DOUBLE_EQUAL (view->priv->zoom, view->priv->min_zoom); } gboolean eom_scroll_view_get_zoom_is_max (EomScrollView *view) { g_return_val_if_fail (EOM_IS_SCROLL_VIEW (view), FALSE); return DOUBLE_EQUAL (view->priv->zoom, MAX_ZOOM_FACTOR); } static void display_next_frame_cb (EomImage *image, gint delay, gpointer data) { EomScrollViewPrivate *priv; EomScrollView *view; if (!EOM_IS_SCROLL_VIEW (data)) return; view = EOM_SCROLL_VIEW (data); priv = view->priv; update_pixbuf (view, eom_image_get_pixbuf (image)); gtk_widget_queue_draw (priv->display); } void eom_scroll_view_set_image (EomScrollView *view, EomImage *image) { EomScrollViewPrivate *priv; g_return_if_fail (EOM_IS_SCROLL_VIEW (view)); priv = view->priv; if (priv->image == image) { return; } if (priv->image != NULL) { free_image_resources (view); } g_assert (priv->image == NULL); g_assert (priv->pixbuf == NULL); if (image != NULL) { eom_image_data_ref (image); if (priv->pixbuf == NULL) { update_pixbuf (view, eom_image_get_pixbuf (image)); set_zoom_fit (view); check_scrollbar_visibility (view, NULL); gtk_widget_queue_draw (priv->display); } priv->image_changed_id = g_signal_connect (image, "changed", G_CALLBACK (image_changed_cb), view); if (eom_image_is_animation (image) == TRUE ) { eom_image_start_animation (image); priv->frame_changed_id = g_signal_connect (image, "next-frame", G_CALLBACK (display_next_frame_cb), view); } } priv->image = image; g_object_notify (G_OBJECT (view), "image"); } /** * eom_scroll_view_get_image: * @view: An #EomScrollView. * * Gets the the currently displayed #EomImage. * * Returns: (transfer full): An #EomImage. **/ EomImage* eom_scroll_view_get_image (EomScrollView *view) { EomImage *img; g_return_val_if_fail (EOM_IS_SCROLL_VIEW (view), NULL); img = view->priv->image; if (img != NULL) g_object_ref (img); return img; } gboolean eom_scroll_view_scrollbars_visible (EomScrollView *view) { if (!gtk_widget_get_visible (view->priv->hbar) && !gtk_widget_get_visible (view->priv->vbar)) return FALSE; return TRUE; } /*=================================== object creation/freeing ---------------------------------*/ static gboolean sv_string_to_rgba_mapping (GValue *value, GVariant *variant, gpointer user_data) { GdkRGBA color; g_return_val_if_fail (g_variant_is_of_type (variant, G_VARIANT_TYPE_STRING), FALSE); if (gdk_rgba_parse (&color, g_variant_get_string (variant, NULL))) { g_value_set_boxed (value, &color); return TRUE; } return FALSE; } static GVariant* sv_rgba_to_string_mapping (const GValue *value, const GVariantType *expected_type, gpointer user_data) { GVariant *variant = NULL; GdkRGBA *color; gchar *hex_val; g_return_val_if_fail (G_VALUE_TYPE (value) == GDK_TYPE_RGBA, NULL); g_return_val_if_fail (g_variant_type_equal (expected_type, G_VARIANT_TYPE_STRING), NULL); color = g_value_get_boxed (value); hex_val = gdk_rgba_to_string(color); variant = g_variant_new_string (hex_val); g_free (hex_val); return variant; } static void eom_scroll_view_init (EomScrollView *view) { GSettings *settings; EomScrollViewPrivate *priv; priv = view->priv = eom_scroll_view_get_instance_private (view); settings = g_settings_new (EOM_CONF_VIEW); priv->zoom = 1.0; priv->min_zoom = MIN_ZOOM_FACTOR; priv->zoom_mode = ZOOM_MODE_FIT; priv->upscale = FALSE; priv->interp_type_in = CAIRO_FILTER_GOOD; priv->interp_type_out = CAIRO_FILTER_GOOD; priv->scroll_wheel_zoom = FALSE; priv->zoom_multiplier = IMAGE_VIEW_ZOOM_MULTIPLIER; priv->image = NULL; priv->pixbuf = NULL; priv->surface = NULL; priv->transp_style = EOM_TRANSP_BACKGROUND; g_warn_if_fail (gdk_rgba_parse(&priv->transp_color, CHECK_BLACK)); priv->cursor = EOM_SCROLL_VIEW_CURSOR_NORMAL; priv->menu = NULL; priv->background_color = NULL; priv->hadj = GTK_ADJUSTMENT (gtk_adjustment_new (0, 100, 0, 10, 10, 100)); g_signal_connect (priv->hadj, "value_changed", G_CALLBACK (adjustment_changed_cb), view); priv->hbar = gtk_scrollbar_new (GTK_ORIENTATION_HORIZONTAL, priv->hadj); priv->vadj = GTK_ADJUSTMENT (gtk_adjustment_new (0, 100, 0, 10, 10, 100)); g_signal_connect (priv->vadj, "value_changed", G_CALLBACK (adjustment_changed_cb), view); priv->vbar = gtk_scrollbar_new (GTK_ORIENTATION_VERTICAL, priv->vadj); priv->display = g_object_new (GTK_TYPE_DRAWING_AREA, "can-focus", TRUE, NULL); priv->scale = gtk_widget_get_scale_factor (priv->display); gtk_widget_add_events (priv->display, GDK_EXPOSURE_MASK | GDK_BUTTON_PRESS_MASK | GDK_BUTTON_RELEASE_MASK | GDK_POINTER_MOTION_MASK | GDK_POINTER_MOTION_HINT_MASK | GDK_SCROLL_MASK | GDK_KEY_PRESS_MASK); g_signal_connect (priv->display, "configure_event", G_CALLBACK (display_size_change), view); g_signal_connect (priv->display, "draw", G_CALLBACK (display_draw), view); g_signal_connect (priv->display, "map_event", G_CALLBACK (display_map_event), view); g_signal_connect (priv->display, "button_press_event", G_CALLBACK (eom_scroll_view_button_press_event), view); g_signal_connect (priv->display, "motion_notify_event", G_CALLBACK (eom_scroll_view_motion_event), view); g_signal_connect (priv->display, "button_release_event", G_CALLBACK (eom_scroll_view_button_release_event), view); g_signal_connect (priv->display, "scroll_event", G_CALLBACK (eom_scroll_view_scroll_event), view); g_signal_connect (priv->display, "focus_in_event", G_CALLBACK (eom_scroll_view_focus_in_event), NULL); g_signal_connect (priv->display, "focus_out_event", G_CALLBACK (eom_scroll_view_focus_out_event), NULL); g_signal_connect (view, "key_press_event", G_CALLBACK (display_key_press_event), view); gtk_drag_source_set (priv->display, GDK_BUTTON1_MASK, target_table, G_N_ELEMENTS (target_table), GDK_ACTION_COPY | GDK_ACTION_MOVE | GDK_ACTION_LINK | GDK_ACTION_ASK); g_signal_connect (priv->display, "drag-data-get", G_CALLBACK (view_on_drag_data_get_cb), view); g_signal_connect (priv->display, "drag-begin", G_CALLBACK (view_on_drag_begin_cb), view); gtk_grid_attach (GTK_GRID (view), priv->display, 0, 0, 1, 1); gtk_widget_set_hexpand (priv->display, TRUE); gtk_widget_set_vexpand (priv->display, TRUE); gtk_grid_attach (GTK_GRID (view), priv->hbar, 0, 1, 1, 1); gtk_widget_set_hexpand (priv->hbar, TRUE); gtk_grid_attach (GTK_GRID (view), priv->vbar, 1, 0, 1, 1); gtk_widget_set_vexpand (priv->vbar, TRUE); g_settings_bind (settings, EOM_CONF_VIEW_USE_BG_COLOR, view, "use-background-color", G_SETTINGS_BIND_DEFAULT); g_settings_bind_with_mapping (settings, EOM_CONF_VIEW_BACKGROUND_COLOR, view, "background-color", G_SETTINGS_BIND_DEFAULT, sv_string_to_rgba_mapping, sv_rgba_to_string_mapping, NULL, NULL); g_settings_bind (settings, EOM_CONF_VIEW_EXTRAPOLATE, view, "antialiasing-in", G_SETTINGS_BIND_GET); g_settings_bind (settings, EOM_CONF_VIEW_INTERPOLATE, view, "antialiasing-out", G_SETTINGS_BIND_GET); g_settings_bind_with_mapping (settings, EOM_CONF_VIEW_TRANS_COLOR, view, "transparency-color", G_SETTINGS_BIND_GET, sv_string_to_rgba_mapping, sv_rgba_to_string_mapping, NULL, NULL); g_settings_bind (settings, EOM_CONF_VIEW_TRANSPARENCY, view, "transparency-style", G_SETTINGS_BIND_GET); g_object_unref (settings); priv->override_bg_color = NULL; priv->background_surface = NULL; } static void eom_scroll_view_dispose (GObject *object) { EomScrollView *view; EomScrollViewPrivate *priv; g_return_if_fail (EOM_IS_SCROLL_VIEW (object)); view = EOM_SCROLL_VIEW (object); priv = view->priv; _clear_hq_redraw_timeout (view); if (priv->idle_id != 0) { g_source_remove (priv->idle_id); priv->idle_id = 0; } if (priv->background_color != NULL) { gdk_rgba_free (priv->background_color); priv->background_color = NULL; } if (priv->override_bg_color != NULL) { gdk_rgba_free (priv->override_bg_color); priv->override_bg_color = NULL; } if (priv->background_surface != NULL) { cairo_surface_destroy (priv->background_surface); priv->background_surface = NULL; } free_image_resources (view); G_OBJECT_CLASS (eom_scroll_view_parent_class)->dispose (object); } static void eom_scroll_view_get_property (GObject *object, guint property_id, GValue *value, GParamSpec *pspec) { EomScrollView *view; EomScrollViewPrivate *priv; g_return_if_fail (EOM_IS_SCROLL_VIEW (object)); view = EOM_SCROLL_VIEW (object); priv = view->priv; switch (property_id) { case PROP_ANTIALIAS_IN: { gboolean filter = (priv->interp_type_in != CAIRO_FILTER_NEAREST); g_value_set_boolean (value, filter); break; } case PROP_ANTIALIAS_OUT: { gboolean filter = (priv->interp_type_out != CAIRO_FILTER_NEAREST); g_value_set_boolean (value, filter); break; } case PROP_USE_BG_COLOR: g_value_set_boolean (value, priv->use_bg_color); break; case PROP_BACKGROUND_COLOR: //FIXME: This doesn't really handle the NULL color. g_value_set_boxed (value, priv->background_color); break; case PROP_SCROLLWHEEL_ZOOM: g_value_set_boolean (value, priv->scroll_wheel_zoom); break; case PROP_TRANSPARENCY_STYLE: g_value_set_enum (value, priv->transp_style); break; case PROP_ZOOM_MULTIPLIER: g_value_set_double (value, priv->zoom_multiplier); break; case PROP_IMAGE: g_value_set_object (value, priv->image); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec); } } static void eom_scroll_view_set_property (GObject *object, guint property_id, const GValue *value, GParamSpec *pspec) { EomScrollView *view; g_return_if_fail (EOM_IS_SCROLL_VIEW (object)); view = EOM_SCROLL_VIEW (object); switch (property_id) { case PROP_ANTIALIAS_IN: eom_scroll_view_set_antialiasing_in (view, g_value_get_boolean (value)); break; case PROP_ANTIALIAS_OUT: eom_scroll_view_set_antialiasing_out (view, g_value_get_boolean (value)); break; case PROP_USE_BG_COLOR: eom_scroll_view_set_use_bg_color (view, g_value_get_boolean (value)); break; case PROP_BACKGROUND_COLOR: { const GdkRGBA *color = g_value_get_boxed (value); eom_scroll_view_set_background_color (view, color); break; } case PROP_SCROLLWHEEL_ZOOM: eom_scroll_view_set_scroll_wheel_zoom (view, g_value_get_boolean (value)); break; case PROP_TRANSP_COLOR: eom_scroll_view_set_transparency_color (view, g_value_get_boxed (value)); break; case PROP_TRANSPARENCY_STYLE: eom_scroll_view_set_transparency (view, g_value_get_enum (value)); break; case PROP_ZOOM_MULTIPLIER: eom_scroll_view_set_zoom_multiplier (view, g_value_get_double (value)); break; case PROP_IMAGE: eom_scroll_view_set_image (view, g_value_get_object (value)); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec); } } static void eom_scroll_view_class_init (EomScrollViewClass *klass) { GObjectClass *gobject_class; GtkWidgetClass *widget_class; gobject_class = (GObjectClass*) klass; widget_class = (GtkWidgetClass*) klass; gobject_class->dispose = eom_scroll_view_dispose; gobject_class->set_property = eom_scroll_view_set_property; gobject_class->get_property = eom_scroll_view_get_property; g_object_class_install_property ( gobject_class, PROP_ANTIALIAS_IN, g_param_spec_boolean ("antialiasing-in", NULL, NULL, TRUE, G_PARAM_READWRITE | G_PARAM_STATIC_NAME)); g_object_class_install_property ( gobject_class, PROP_ANTIALIAS_OUT, g_param_spec_boolean ("antialiasing-out", NULL, NULL, TRUE, G_PARAM_READWRITE | G_PARAM_STATIC_NAME)); /** * EomScrollView:background-color: * * This is the default background color used for painting the background * of the image view. If set to %NULL the color is determined by the * active GTK theme. */ g_object_class_install_property ( gobject_class, PROP_BACKGROUND_COLOR, g_param_spec_boxed ("background-color", NULL, NULL, GDK_TYPE_RGBA, G_PARAM_READWRITE | G_PARAM_STATIC_NAME)); g_object_class_install_property ( gobject_class, PROP_USE_BG_COLOR, g_param_spec_boolean ("use-background-color", NULL, NULL, FALSE, G_PARAM_READWRITE | G_PARAM_STATIC_NAME)); /** * EomScrollView:zoom-multiplier: * * The current zoom factor is multiplied with this value + 1.0 when * scrolling with the scrollwheel to determine the next zoom factor. */ g_object_class_install_property ( gobject_class, PROP_ZOOM_MULTIPLIER, g_param_spec_double ("zoom-multiplier", NULL, NULL, -G_MAXDOUBLE, G_MAXDOUBLE -1.0, 0.05, G_PARAM_READWRITE | G_PARAM_STATIC_NAME)); /** * EomScrollView:scrollwheel-zoom: * * If %TRUE the scrollwheel will zoom the view, otherwise it will be * used for scrolling a zoomed image. */ g_object_class_install_property ( gobject_class, PROP_SCROLLWHEEL_ZOOM, g_param_spec_boolean ("scrollwheel-zoom", NULL, NULL, TRUE, G_PARAM_READWRITE | G_PARAM_STATIC_NAME)); /** * EomScrollView:image: * * This is the currently display #EomImage. */ g_object_class_install_property ( gobject_class, PROP_IMAGE, g_param_spec_object ("image", NULL, NULL, EOM_TYPE_IMAGE, G_PARAM_READWRITE | G_PARAM_STATIC_NAME)); /** * EomScrollView:transparency-color: * * This is the color used to fill the transparent parts of an image * if :transparency-style is set to use a custom color. */ g_object_class_install_property ( gobject_class, PROP_TRANSP_COLOR, g_param_spec_boxed ("transparency-color", NULL, NULL, GDK_TYPE_RGBA, G_PARAM_WRITABLE | G_PARAM_STATIC_NAME)); /** * EomScrollView:transparency-style: * * Determines how to fill the shown image's transparent areas. */ g_object_class_install_property ( gobject_class, PROP_TRANSPARENCY_STYLE, g_param_spec_enum ("transparency-style", NULL, NULL, EOM_TYPE_TRANSPARENCY_STYLE, EOM_TRANSP_CHECKED, G_PARAM_READWRITE | G_PARAM_STATIC_NAME)); view_signals [SIGNAL_ZOOM_CHANGED] = g_signal_new ("zoom_changed", EOM_TYPE_SCROLL_VIEW, G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (EomScrollViewClass, zoom_changed), NULL, NULL, eom_marshal_VOID__DOUBLE, G_TYPE_NONE, 1, G_TYPE_DOUBLE); widget_class->size_allocate = eom_scroll_view_size_allocate; } static void view_on_drag_begin_cb (GtkWidget *widget, GdkDragContext *context, gpointer user_data) { EomScrollView *view; EomImage *image; GdkPixbuf *thumbnail; gint width, height; view = EOM_SCROLL_VIEW (user_data); image = view->priv->image; thumbnail = eom_image_get_thumbnail (image); if (thumbnail) { width = gdk_pixbuf_get_width (thumbnail) / view->priv->scale; height = gdk_pixbuf_get_height (thumbnail) / view->priv->scale; gtk_drag_set_icon_pixbuf (context, thumbnail, width/2, height/2); g_object_unref (thumbnail); } } static void view_on_drag_data_get_cb (GtkWidget *widget, GdkDragContext *drag_context, GtkSelectionData *data, guint info, guint time, gpointer user_data) { EomScrollView *view; EomImage *image; gchar *uris[2]; GFile *file; view = EOM_SCROLL_VIEW (user_data); image = view->priv->image; file = eom_image_get_file (image); uris[0] = g_file_get_uri (file); uris[1] = NULL; gtk_selection_data_set_uris (data, uris); g_free (uris[0]); g_object_unref (file); } GtkWidget* eom_scroll_view_new (void) { GtkWidget *widget; widget = g_object_new (EOM_TYPE_SCROLL_VIEW, "can-focus", TRUE, "row-homogeneous", FALSE, "column-homogeneous", FALSE, NULL); return widget; } static gboolean view_on_button_press_event_cb (GtkWidget *widget, GdkEventButton *event, gpointer user_data) { EomScrollView *view = EOM_SCROLL_VIEW (widget); /* Ignore double-clicks and triple-clicks */ if (event->button == 3 && event->type == GDK_BUTTON_PRESS) { gtk_menu_popup_at_pointer (GTK_MENU (view->priv->menu), (const GdkEvent*) event); return TRUE; } return FALSE; } void eom_scroll_view_set_popup (EomScrollView *view, GtkMenu *menu) { g_return_if_fail (EOM_IS_SCROLL_VIEW (view)); g_return_if_fail (view->priv->menu == NULL); view->priv->menu = g_object_ref (GTK_WIDGET (menu)); gtk_menu_attach_to_widget (GTK_MENU (view->priv->menu), GTK_WIDGET (view), NULL); g_signal_connect (view, "button_press_event", G_CALLBACK (view_on_button_press_event_cb), NULL); } static gboolean _eom_gdk_rgba_equal0 (const GdkRGBA *a, const GdkRGBA *b) { if (a == NULL || b == NULL) return (a == b); return gdk_rgba_equal (a, b); } static gboolean _eom_replace_gdk_rgba (GdkRGBA **dest, const GdkRGBA *src) { GdkRGBA *old = *dest; if (_eom_gdk_rgba_equal0 (old, src)) return FALSE; if (old != NULL) gdk_rgba_free (old); *dest = (src) ? gdk_rgba_copy (src) : NULL; return TRUE; } static void _eom_scroll_view_update_bg_color (EomScrollView *view) { EomScrollViewPrivate *priv = view->priv; if (priv->transp_style == EOM_TRANSP_BACKGROUND && priv->background_surface != NULL) { /* Delete the SVG background to have it recreated with * the correct color during the next SVG redraw */ cairo_surface_destroy (priv->background_surface); priv->background_surface = NULL; } gtk_widget_queue_draw (priv->display); } void eom_scroll_view_set_background_color (EomScrollView *view, const GdkRGBA *color) { g_return_if_fail (EOM_IS_SCROLL_VIEW (view)); if (_eom_replace_gdk_rgba (&view->priv->background_color, color)) _eom_scroll_view_update_bg_color (view); } void eom_scroll_view_override_bg_color (EomScrollView *view, const GdkRGBA *color) { g_return_if_fail (EOM_IS_SCROLL_VIEW (view)); if (_eom_replace_gdk_rgba (&view->priv->override_bg_color, color)) _eom_scroll_view_update_bg_color (view); } void eom_scroll_view_set_use_bg_color (EomScrollView *view, gboolean use) { EomScrollViewPrivate *priv; g_return_if_fail (EOM_IS_SCROLL_VIEW (view)); priv = view->priv; if (use != priv->use_bg_color) { priv->use_bg_color = use; _eom_scroll_view_update_bg_color (view); g_object_notify (G_OBJECT (view), "use-background-color"); } } void eom_scroll_view_set_scroll_wheel_zoom (EomScrollView *view, gboolean scroll_wheel_zoom) { g_return_if_fail (EOM_IS_SCROLL_VIEW (view)); if (view->priv->scroll_wheel_zoom != scroll_wheel_zoom) { view->priv->scroll_wheel_zoom = scroll_wheel_zoom; g_object_notify (G_OBJECT (view), "scrollwheel-zoom"); } } void eom_scroll_view_set_zoom_multiplier (EomScrollView *view, gdouble zoom_multiplier) { g_return_if_fail (EOM_IS_SCROLL_VIEW (view)); view->priv->zoom_multiplier = 1.0 + zoom_multiplier; g_object_notify (G_OBJECT (view), "zoom-multiplier"); }