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authorPerberos <[email protected]>2011-12-01 21:51:44 -0300
committerPerberos <[email protected]>2011-12-01 21:51:44 -0300
commit0b0e6bc987da4fd88a7854ebb12bde705e92c428 (patch)
tree47d329edd31c67eaa36b2147780e37e197e901b5 /capplets/display/scrollarea.c
downloadmate-control-center-0b0e6bc987da4fd88a7854ebb12bde705e92c428.tar.bz2
mate-control-center-0b0e6bc987da4fd88a7854ebb12bde705e92c428.tar.xz
moving from https://github.com/perberos/mate-desktop-environment
Diffstat (limited to 'capplets/display/scrollarea.c')
-rw-r--r--capplets/display/scrollarea.c1944
1 files changed, 1944 insertions, 0 deletions
diff --git a/capplets/display/scrollarea.c b/capplets/display/scrollarea.c
new file mode 100644
index 00000000..9da2fb66
--- /dev/null
+++ b/capplets/display/scrollarea.c
@@ -0,0 +1,1944 @@
+/* Copyright 2006, 2007, 2008, Soren Sandmann <[email protected]>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#include <gdk/gdkprivate.h> /* For GDK_PARENT_RELATIVE_BG */
+#include "scrollarea.h"
+#include "foo-marshal.h"
+
+G_DEFINE_TYPE (FooScrollArea, foo_scroll_area, GTK_TYPE_CONTAINER);
+
+static GtkWidgetClass *parent_class;
+
+typedef struct BackingStore BackingStore;
+
+typedef void (* ExposeFunc) (cairo_t *cr, GdkRegion *region, gpointer data);
+
+#if 0
+static void backing_store_draw (BackingStore *store,
+ GdkDrawable *dest,
+ GdkRegion *clip,
+ int dest_x,
+ int dest_y);
+static void backing_store_scroll (BackingStore *store,
+ int dx, int dy);
+static void backing_store_invalidate_rect (BackingStore *store,
+ GdkRectangle *rect);
+static void backing_store_invalidate_region (BackingStore *store,
+ GdkRegion *region);
+static void backing_store_invalidate_all (BackingStore *store);
+static BackingStore *backing_store_new (GdkWindow *window,
+ int width, int height);
+static void backing_store_resize (BackingStore *store,
+ int width, int height);
+static void backing_store_process_updates (BackingStore *store,
+ ExposeFunc func,
+ gpointer data);
+static void backing_store_free (BackingStore *store);
+#endif
+
+typedef struct InputPath InputPath;
+typedef struct InputRegion InputRegion;
+typedef struct AutoScrollInfo AutoScrollInfo;
+
+struct InputPath
+{
+ gboolean is_stroke;
+ cairo_fill_rule_t fill_rule;
+ double line_width;
+ cairo_path_t *path; /* In canvas coordinates */
+
+ FooScrollAreaEventFunc func;
+ gpointer data;
+
+ InputPath *next;
+};
+
+/* InputRegions are mutually disjoint */
+struct InputRegion
+{
+ GdkRegion *region; /* the boundary of this area in canvas coordinates */
+ InputPath *paths;
+};
+
+struct AutoScrollInfo
+{
+ int dx;
+ int dy;
+ int timeout_id;
+ int begin_x;
+ int begin_y;
+ double res_x;
+ double res_y;
+ GTimer *timer;
+};
+
+struct FooScrollAreaPrivate
+{
+ GdkWindow *input_window;
+
+ int width;
+ int height;
+
+ GtkAdjustment *hadj;
+ GtkAdjustment *vadj;
+ int x_offset;
+ int y_offset;
+
+ int min_width;
+ int min_height;
+
+ GPtrArray *input_regions;
+
+ AutoScrollInfo *auto_scroll_info;
+
+ /* During expose, this region is set to the region
+ * being exposed. At other times, it is NULL
+ *
+ * It is used for clipping of input areas
+ */
+ GdkRegion *expose_region;
+ InputRegion *current_input;
+
+ gboolean grabbed;
+ FooScrollAreaEventFunc grab_func;
+ gpointer grab_data;
+
+ GdkPixmap *pixmap;
+ GdkRegion *update_region; /* In canvas coordinates */
+};
+
+enum
+{
+ VIEWPORT_CHANGED,
+ PAINT,
+ INPUT,
+ LAST_SIGNAL,
+};
+
+static guint signals [LAST_SIGNAL] = { 0 };
+
+static void foo_scroll_area_size_request (GtkWidget *widget,
+ GtkRequisition *requisition);
+static gboolean foo_scroll_area_expose (GtkWidget *widget,
+ GdkEventExpose *expose);
+static void foo_scroll_area_size_allocate (GtkWidget *widget,
+ GtkAllocation *allocation);
+static void foo_scroll_area_set_scroll_adjustments (FooScrollArea *scroll_area,
+ GtkAdjustment *hadjustment,
+ GtkAdjustment *vadjustment);
+static void foo_scroll_area_realize (GtkWidget *widget);
+static void foo_scroll_area_unrealize (GtkWidget *widget);
+static void foo_scroll_area_map (GtkWidget *widget);
+static void foo_scroll_area_unmap (GtkWidget *widget);
+static gboolean foo_scroll_area_button_press (GtkWidget *widget,
+ GdkEventButton *event);
+static gboolean foo_scroll_area_button_release (GtkWidget *widget,
+ GdkEventButton *event);
+static gboolean foo_scroll_area_motion (GtkWidget *widget,
+ GdkEventMotion *event);
+
+static void
+foo_scroll_area_map (GtkWidget *widget)
+{
+ FooScrollArea *area = FOO_SCROLL_AREA (widget);
+
+ GTK_WIDGET_CLASS (parent_class)->map (widget);
+
+ if (area->priv->input_window)
+ gdk_window_show (area->priv->input_window);
+}
+
+static void
+foo_scroll_area_unmap (GtkWidget *widget)
+{
+ FooScrollArea *area = FOO_SCROLL_AREA (widget);
+
+ if (area->priv->input_window)
+ gdk_window_hide (area->priv->input_window);
+
+ GTK_WIDGET_CLASS (parent_class)->unmap (widget);
+}
+
+static void
+foo_scroll_area_finalize (GObject *object)
+{
+ FooScrollArea *scroll_area = FOO_SCROLL_AREA (object);
+
+ g_object_unref (scroll_area->priv->hadj);
+ g_object_unref (scroll_area->priv->vadj);
+
+ g_ptr_array_free (scroll_area->priv->input_regions, TRUE);
+
+ g_free (scroll_area->priv);
+
+ G_OBJECT_CLASS (foo_scroll_area_parent_class)->finalize (object);
+}
+
+static void
+foo_scroll_area_class_init (FooScrollAreaClass *class)
+{
+ GObjectClass *object_class = G_OBJECT_CLASS (class);
+ GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (class);
+
+ object_class->finalize = foo_scroll_area_finalize;
+ widget_class->size_request = foo_scroll_area_size_request;
+ widget_class->expose_event = foo_scroll_area_expose;
+ widget_class->size_allocate = foo_scroll_area_size_allocate;
+ widget_class->realize = foo_scroll_area_realize;
+ widget_class->unrealize = foo_scroll_area_unrealize;
+ widget_class->button_press_event = foo_scroll_area_button_press;
+ widget_class->button_release_event = foo_scroll_area_button_release;
+ widget_class->motion_notify_event = foo_scroll_area_motion;
+ widget_class->map = foo_scroll_area_map;
+ widget_class->unmap = foo_scroll_area_unmap;
+
+ class->set_scroll_adjustments = foo_scroll_area_set_scroll_adjustments;
+
+ parent_class = g_type_class_peek_parent (class);
+
+ signals[VIEWPORT_CHANGED] =
+ g_signal_new ("viewport_changed",
+ G_OBJECT_CLASS_TYPE (object_class),
+ G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
+ G_STRUCT_OFFSET (FooScrollAreaClass,
+ viewport_changed),
+ NULL, NULL,
+ foo_marshal_VOID__BOXED_BOXED,
+ G_TYPE_NONE, 2,
+ GDK_TYPE_RECTANGLE,
+ GDK_TYPE_RECTANGLE);
+
+ signals[PAINT] =
+ g_signal_new ("paint",
+ G_OBJECT_CLASS_TYPE (object_class),
+ G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
+ G_STRUCT_OFFSET (FooScrollAreaClass,
+ paint),
+ NULL, NULL,
+ foo_marshal_VOID__POINTER_BOXED_POINTER,
+ G_TYPE_NONE, 3,
+ G_TYPE_POINTER,
+ GDK_TYPE_RECTANGLE,
+ G_TYPE_POINTER);
+
+ widget_class->set_scroll_adjustments_signal =
+ g_signal_new ("set_scroll_adjustments",
+ G_OBJECT_CLASS_TYPE (object_class),
+ G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
+ G_STRUCT_OFFSET (FooScrollAreaClass,
+ set_scroll_adjustments),
+ NULL, NULL,
+ foo_marshal_VOID__OBJECT_OBJECT,
+ G_TYPE_NONE, 2,
+ GTK_TYPE_ADJUSTMENT,
+ GTK_TYPE_ADJUSTMENT);
+}
+
+static GtkAdjustment *
+new_adjustment (void)
+{
+ return GTK_ADJUSTMENT (gtk_adjustment_new (0.0, 0.0, 0.0, 0.0, 0.0, 0.0));
+}
+
+static void
+foo_scroll_area_init (FooScrollArea *scroll_area)
+{
+ GtkWidget *widget;
+
+ widget = GTK_WIDGET (scroll_area);
+
+ gtk_widget_set_has_window (widget, FALSE);
+ gtk_widget_set_redraw_on_allocate (widget, FALSE);
+
+ scroll_area->priv = g_new0 (FooScrollAreaPrivate, 1);
+ scroll_area->priv->width = 0;
+ scroll_area->priv->height = 0;
+ scroll_area->priv->hadj = g_object_ref_sink (new_adjustment());
+ scroll_area->priv->vadj = g_object_ref_sink (new_adjustment());
+ scroll_area->priv->x_offset = 0.0;
+ scroll_area->priv->y_offset = 0.0;
+ scroll_area->priv->min_width = -1;
+ scroll_area->priv->min_height = -1;
+ scroll_area->priv->auto_scroll_info = NULL;
+ scroll_area->priv->input_regions = g_ptr_array_new ();
+ scroll_area->priv->pixmap = NULL;
+ scroll_area->priv->update_region = gdk_region_new ();
+
+ gtk_widget_set_double_buffered (widget, FALSE);
+}
+
+static void
+translate_cairo_device (cairo_t *cr,
+ int x_offset,
+ int y_offset)
+{
+ cairo_surface_t *surface = cairo_get_target (cr);
+ double dev_x;
+ double dev_y;
+
+ cairo_surface_get_device_offset (surface, &dev_x, &dev_y);
+ dev_x += x_offset;
+ dev_y += y_offset;
+ cairo_surface_set_device_offset (surface, dev_x, dev_y);
+}
+
+#if 0
+static void
+print_region (const char *header, GdkRegion *region)
+{
+ GdkRectangle *rects;
+ int n_rects;
+ int i;
+
+ g_print ("%s\n", header);
+
+ gdk_region_get_rectangles (region, &rects, &n_rects);
+ for (i = 0; i < n_rects; ++i)
+ {
+ GdkRectangle *rect = &(rects[i]);
+ g_print (" %d %d %d %d\n",
+ rect->x, rect->y, rect->width, rect->height);
+ }
+}
+#endif
+
+typedef void (* PathForeachFunc) (double *x,
+ double *y,
+ gpointer data);
+
+static void
+path_foreach_point (cairo_path_t *path,
+ PathForeachFunc func,
+ gpointer user_data)
+{
+ int i;
+
+ for (i = 0; i < path->num_data; i += path->data[i].header.length)
+ {
+ cairo_path_data_t *data = &(path->data[i]);
+
+ switch (data->header.type)
+ {
+ case CAIRO_PATH_MOVE_TO:
+ case CAIRO_PATH_LINE_TO:
+ func (&(data[1].point.x), &(data[1].point.y), user_data);
+ break;
+
+ case CAIRO_PATH_CURVE_TO:
+ func (&(data[1].point.x), &(data[1].point.y), user_data);
+ func (&(data[2].point.x), &(data[2].point.y), user_data);
+ func (&(data[3].point.x), &(data[3].point.y), user_data);
+ break;
+
+ case CAIRO_PATH_CLOSE_PATH:
+ break;
+ }
+ }
+}
+
+typedef struct
+{
+ double x1, y1, x2, y2;
+} Box;
+
+#if 0
+static void
+update_box (double *x, double *y, gpointer data)
+{
+ Box *box = data;
+
+ if (*x < box->x1)
+ box->x1 = *x;
+
+ if (*y < box->y1)
+ box->y1 = *y;
+
+ if (*y > box->y2)
+ box->y2 = *y;
+
+ if (*x > box->x2)
+ box->x2 = *x;
+}
+#endif
+
+#if 0
+static void
+path_compute_extents (cairo_path_t *path,
+ GdkRectangle *rect)
+{
+ if (rect)
+ {
+ Box box = { G_MAXDOUBLE, G_MAXDOUBLE, G_MINDOUBLE, G_MINDOUBLE };
+
+ path_foreach_point (path, update_box, &box);
+
+ rect->x = box.x1;
+ rect->y = box.y1;
+ rect->width = box.x2 - box.x1;
+ rect->height = box.y2 - box.y1;
+ }
+}
+#endif
+
+static void
+input_path_free_list (InputPath *paths)
+{
+ if (!paths)
+ return;
+
+ input_path_free_list (paths->next);
+ cairo_path_destroy (paths->path);
+ g_free (paths);
+}
+
+static void
+input_region_free (InputRegion *region)
+{
+ input_path_free_list (region->paths);
+ gdk_region_destroy (region->region);
+
+ g_free (region);
+}
+
+static void
+get_viewport (FooScrollArea *scroll_area,
+ GdkRectangle *viewport)
+{
+ GtkAllocation allocation;
+ GtkWidget *widget = GTK_WIDGET (scroll_area);
+
+ gtk_widget_get_allocation (widget, &allocation);
+
+ viewport->x = scroll_area->priv->x_offset;
+ viewport->y = scroll_area->priv->y_offset;
+ viewport->width = allocation.width;
+ viewport->height = allocation.height;
+}
+
+static void
+allocation_to_canvas (FooScrollArea *area,
+ int *x,
+ int *y)
+{
+ *x += area->priv->x_offset;
+ *y += area->priv->y_offset;
+}
+
+static void
+clear_exposed_input_region (FooScrollArea *area,
+ GdkRegion *exposed) /* in canvas coordinates */
+{
+ int i;
+ GdkRegion *viewport;
+ GdkRectangle allocation;
+
+ gtk_widget_get_allocation (GTK_WIDGET (area), &allocation);
+ allocation.x = 0;
+ allocation.y = 0;
+ allocation_to_canvas (area, &allocation.x, &allocation.y);
+ viewport = gdk_region_rectangle (&allocation);
+ gdk_region_subtract (viewport, exposed);
+
+ for (i = 0; i < area->priv->input_regions->len; ++i)
+ {
+ InputRegion *region = area->priv->input_regions->pdata[i];
+
+ gdk_region_intersect (region->region, viewport);
+
+ if (gdk_region_empty (region->region))
+ {
+ input_region_free (region);
+ g_ptr_array_remove_index_fast (area->priv->input_regions, i--);
+ }
+ }
+
+ gdk_region_destroy (viewport);
+
+#if 0
+ path = region->paths;
+ while (path != NULL)
+ {
+ GdkRectangle rect;
+
+ path_compute_extents (path->path, &rect);
+
+ if (gdk_region_rect_in (area->priv->expose_region, &rect) == GDK_OVERLAP_RECTANGLE_IN)
+ g_print ("we would have deleted it\n");
+#if 0
+ else
+ g_print ("nope (%d %d %d %d)\n", );
+#endif
+
+ path = path->next;
+ }
+
+ /* FIXME: we should also delete paths (and path segments)
+ * completely contained in the expose_region
+ */
+ }
+#endif
+}
+
+static void
+setup_background_cr (GdkWindow *window,
+ cairo_t *cr,
+ int x_offset,
+ int y_offset)
+{
+ GdkWindowObject *private = (GdkWindowObject *)window;
+
+ if (private->bg_pixmap == GDK_PARENT_RELATIVE_BG && private->parent)
+ {
+ x_offset += private->x;
+ y_offset += private->y;
+
+ setup_background_cr (GDK_WINDOW (private->parent), cr, x_offset, y_offset);
+ }
+ else if (private->bg_pixmap &&
+ private->bg_pixmap != GDK_PARENT_RELATIVE_BG &&
+ private->bg_pixmap != GDK_NO_BG)
+ {
+ gdk_cairo_set_source_pixmap (cr, private->bg_pixmap, -x_offset, -y_offset);
+ }
+ else
+ {
+ gdk_cairo_set_source_color (cr, &private->bg_color);
+ }
+}
+
+static void
+initialize_background (GtkWidget *widget,
+ cairo_t *cr)
+{
+ setup_background_cr (gtk_widget_get_window (widget), cr, 0, 0);
+
+ cairo_paint (cr);
+}
+
+static void
+clip_to_region (cairo_t *cr, GdkRegion *region)
+{
+ int n_rects;
+ GdkRectangle *rects;
+
+ gdk_region_get_rectangles (region, &rects, &n_rects);
+
+ cairo_new_path (cr);
+ while (n_rects--)
+ {
+ GdkRectangle *rect = &(rects[n_rects]);
+
+ cairo_rectangle (cr, rect->x, rect->y, rect->width, rect->height);
+ }
+ cairo_clip (cr);
+
+ g_free (rects);
+}
+
+static void
+simple_draw_drawable (GdkDrawable *dst,
+ GdkDrawable *src,
+ int src_x,
+ int src_y,
+ int dst_x,
+ int dst_y,
+ int width,
+ int height)
+{
+ GdkGC *gc = gdk_gc_new (dst);
+
+ gdk_draw_drawable (dst, gc, src, src_x, src_y, dst_x, dst_y, width, height);
+
+ g_object_unref (gc);
+}
+
+static gboolean
+foo_scroll_area_expose (GtkWidget *widget,
+ GdkEventExpose *expose)
+{
+ FooScrollArea *scroll_area = FOO_SCROLL_AREA (widget);
+ cairo_t *cr;
+ GdkRectangle extents;
+ GdkRegion *region;
+ int x_offset, y_offset;
+ GdkGC *gc;
+ GtkAllocation widget_allocation;
+ GdkWindow *window = gtk_widget_get_window (widget);
+
+ /* I don't think expose can ever recurse for the same area */
+ g_assert (!scroll_area->priv->expose_region);
+
+ /* Note that this function can be called at a time
+ * where the adj->value is different from x_offset.
+ * Ie., the GtkScrolledWindow changed the adj->value
+ * without emitting the value_changed signal.
+ *
+ * Hence we must always use the value we got
+ * the last time the signal was emitted, ie.,
+ * priv->{x,y}_offset.
+ */
+
+ x_offset = scroll_area->priv->x_offset;
+ y_offset = scroll_area->priv->y_offset;
+
+ scroll_area->priv->expose_region = expose->region;
+
+ /* Setup input areas */
+ clear_exposed_input_region (scroll_area, scroll_area->priv->update_region);
+
+ scroll_area->priv->current_input = g_new0 (InputRegion, 1);
+ scroll_area->priv->current_input->region = gdk_region_copy (scroll_area->priv->update_region);
+ scroll_area->priv->current_input->paths = NULL;
+ g_ptr_array_add (scroll_area->priv->input_regions,
+ scroll_area->priv->current_input);
+
+ region = scroll_area->priv->update_region;
+ scroll_area->priv->update_region = gdk_region_new ();
+
+ /* Create cairo context */
+ cr = gdk_cairo_create (scroll_area->priv->pixmap);
+ translate_cairo_device (cr, -x_offset, -y_offset);
+ clip_to_region (cr, region);
+ initialize_background (widget, cr);
+
+ /* Create regions */
+ gdk_region_get_clipbox (region, &extents);
+
+ g_signal_emit (widget, signals[PAINT], 0, cr, &extents, region);
+
+ /* Destroy stuff */
+ cairo_destroy (cr);
+
+ scroll_area->priv->expose_region = NULL;
+ scroll_area->priv->current_input = NULL;
+
+ /* Finally draw the backing pixmap */
+ gc = gdk_gc_new (window);
+
+ gdk_gc_set_clip_region (gc, expose->region);
+
+ gtk_widget_get_allocation (widget, &widget_allocation);
+ gdk_draw_drawable (window, gc, scroll_area->priv->pixmap,
+ 0, 0, widget_allocation.x, widget_allocation.y,
+ widget_allocation.width, widget_allocation.height);
+
+ g_object_unref (gc);
+ gdk_region_destroy (region);
+
+ return TRUE;
+}
+
+void
+foo_scroll_area_get_viewport (FooScrollArea *scroll_area,
+ GdkRectangle *viewport)
+{
+ g_return_if_fail (FOO_IS_SCROLL_AREA (scroll_area));
+
+ if (!viewport)
+ return;
+
+ get_viewport (scroll_area, viewport);
+}
+
+static void
+process_event (FooScrollArea *scroll_area,
+ FooScrollAreaEventType input_type,
+ int x,
+ int y);
+
+static void
+emit_viewport_changed (FooScrollArea *scroll_area,
+ GdkRectangle *new_viewport,
+ GdkRectangle *old_viewport)
+{
+ int px, py;
+ g_signal_emit (scroll_area, signals[VIEWPORT_CHANGED], 0,
+ new_viewport, old_viewport);
+
+ gdk_window_get_pointer (scroll_area->priv->input_window, &px, &py, NULL);
+
+#if 0
+ g_print ("procc\n");
+#endif
+
+ process_event (scroll_area, FOO_MOTION, px, py);
+}
+
+static void
+clamp_adjustment (GtkAdjustment *adj)
+{
+ if (gtk_adjustment_get_upper (adj) >= gtk_adjustment_get_page_size (adj))
+ gtk_adjustment_set_value (adj, CLAMP (gtk_adjustment_get_value (adj), 0.0,
+ gtk_adjustment_get_upper (adj)
+ - gtk_adjustment_get_page_size (adj)));
+ else
+ gtk_adjustment_set_value (adj, 0.0);
+
+ gtk_adjustment_changed (adj);
+}
+
+static gboolean
+set_adjustment_values (FooScrollArea *scroll_area)
+{
+ GtkAllocation allocation;
+
+ GtkAdjustment *hadj = scroll_area->priv->hadj;
+ GtkAdjustment *vadj = scroll_area->priv->vadj;
+
+ /* Horizontal */
+ gtk_widget_get_allocation (GTK_WIDGET (scroll_area), &allocation);
+ g_object_freeze_notify (G_OBJECT (hadj));
+ gtk_adjustment_set_page_size (hadj, allocation.width);
+ gtk_adjustment_set_step_increment (hadj, 0.1 * allocation.width);
+ gtk_adjustment_set_page_increment (hadj, 0.9 * allocation.width);
+ gtk_adjustment_set_lower (hadj, 0.0);
+ gtk_adjustment_set_upper (hadj, scroll_area->priv->width);
+ g_object_thaw_notify (G_OBJECT (hadj));
+
+ /* Vertical */
+ g_object_freeze_notify (G_OBJECT (vadj));
+ gtk_adjustment_set_page_size (vadj, allocation.height);
+ gtk_adjustment_set_step_increment (vadj, 0.1 * allocation.height);
+ gtk_adjustment_set_page_increment (vadj, 0.9 * allocation.height);
+ gtk_adjustment_set_lower (vadj, 0.0);
+ gtk_adjustment_set_upper (vadj, scroll_area->priv->height);
+ g_object_thaw_notify (G_OBJECT (vadj));
+
+ clamp_adjustment (hadj);
+ clamp_adjustment (vadj);
+
+ return TRUE;
+}
+
+static void
+foo_scroll_area_realize (GtkWidget *widget)
+{
+ FooScrollArea *area = FOO_SCROLL_AREA (widget);
+ GdkWindowAttr attributes;
+ GtkAllocation widget_allocation;
+ GdkWindow *window;
+ gint attributes_mask;
+
+ gtk_widget_get_allocation (widget, &widget_allocation);
+ gtk_widget_set_realized (widget, TRUE);
+
+ attributes.window_type = GDK_WINDOW_CHILD;
+ attributes.x = widget_allocation.x;
+ attributes.y = widget_allocation.y;
+ attributes.width = widget_allocation.width;
+ attributes.height = widget_allocation.height;
+ attributes.wclass = GDK_INPUT_ONLY;
+ attributes.event_mask = gtk_widget_get_events (widget);
+ attributes.event_mask |= (GDK_BUTTON_PRESS_MASK |
+ GDK_BUTTON_RELEASE_MASK |
+ GDK_BUTTON1_MOTION_MASK |
+ GDK_BUTTON2_MOTION_MASK |
+ GDK_BUTTON3_MOTION_MASK |
+ GDK_POINTER_MOTION_MASK |
+ GDK_ENTER_NOTIFY_MASK |
+ GDK_LEAVE_NOTIFY_MASK);
+
+ attributes_mask = GDK_WA_X | GDK_WA_Y;
+
+ window = gtk_widget_get_parent_window (widget);
+ gtk_widget_set_window (widget, window);
+ g_object_ref (window);
+
+ area->priv->input_window = gdk_window_new (window,
+ &attributes, attributes_mask);
+ area->priv->pixmap = gdk_pixmap_new (window,
+ widget_allocation.width,
+ widget_allocation.height,
+ -1);
+ gdk_window_set_user_data (area->priv->input_window, area);
+
+ gtk_widget_style_attach (widget);
+}
+
+static void
+foo_scroll_area_unrealize (GtkWidget *widget)
+{
+ FooScrollArea *area = FOO_SCROLL_AREA (widget);
+
+ if (area->priv->input_window)
+ {
+ gdk_window_set_user_data (area->priv->input_window, NULL);
+ gdk_window_destroy (area->priv->input_window);
+ area->priv->input_window = NULL;
+ }
+
+ GTK_WIDGET_CLASS (parent_class)->unrealize (widget);
+}
+
+static GdkPixmap *
+create_new_pixmap (GtkWidget *widget,
+ GdkPixmap *old)
+{
+ GtkAllocation widget_allocation;
+ GdkPixmap *new;
+
+ gtk_widget_get_allocation (widget, &widget_allocation);
+ new = gdk_pixmap_new (gtk_widget_get_window (widget),
+ widget_allocation.width,
+ widget_allocation.height,
+ -1);
+
+ /* Unfortunately we don't know in which direction we were resized,
+ * so we just assume we were dragged from the south-east corner.
+ *
+ * Although, maybe we could get the root coordinates of the input-window?
+ * That might just work, actually. We need to make sure marco uses
+ * static gravity for the window before this will be useful.
+ */
+ simple_draw_drawable (new, old, 0, 0, 0, 0, -1, -1);
+
+ return new;
+}
+
+static void
+allocation_to_canvas_region (FooScrollArea *area,
+ GdkRegion *region)
+{
+ gdk_region_offset (region, area->priv->x_offset, area->priv->y_offset);
+}
+
+
+static void
+foo_scroll_area_size_allocate (GtkWidget *widget,
+ GtkAllocation *allocation)
+{
+ FooScrollArea *scroll_area = FOO_SCROLL_AREA (widget);
+ GdkRectangle new_viewport;
+ GdkRectangle old_viewport;
+ GdkRegion *old_allocation;
+ GdkRegion *invalid;
+ GtkAllocation widget_allocation;
+
+ get_viewport (scroll_area, &old_viewport);
+
+ gtk_widget_get_allocation (widget, &widget_allocation);
+ old_allocation = gdk_region_rectangle (&widget_allocation);
+ gdk_region_offset (old_allocation,
+ -widget_allocation.x, -widget_allocation.y);
+ invalid = gdk_region_rectangle (allocation);
+ gdk_region_offset (invalid, -allocation->x, -allocation->y);
+ gdk_region_xor (invalid, old_allocation);
+ allocation_to_canvas_region (scroll_area, invalid);
+ foo_scroll_area_invalidate_region (scroll_area, invalid);
+ gdk_region_destroy (old_allocation);
+ gdk_region_destroy (invalid);
+
+ gtk_widget_set_allocation (widget, allocation);
+
+ if (scroll_area->priv->input_window)
+ {
+ GdkPixmap *new_pixmap;
+
+ gdk_window_move_resize (scroll_area->priv->input_window,
+ allocation->x, allocation->y,
+ allocation->width, allocation->height);
+
+ new_pixmap = create_new_pixmap (widget, scroll_area->priv->pixmap);
+
+ g_object_unref (scroll_area->priv->pixmap);
+
+ scroll_area->priv->pixmap = new_pixmap;
+ }
+
+ get_viewport (scroll_area, &new_viewport);
+
+ emit_viewport_changed (scroll_area, &new_viewport, &old_viewport);
+}
+
+static void
+emit_input (FooScrollArea *scroll_area,
+ FooScrollAreaEventType type,
+ int x,
+ int y,
+ FooScrollAreaEventFunc func,
+ gpointer data)
+{
+ FooScrollAreaEvent event;
+
+ if (!func)
+ return;
+
+ if (type != FOO_MOTION)
+ emit_input (scroll_area, FOO_MOTION, x, y, func, data);
+
+#if 0
+ x += scroll_area->priv->x_offset;
+ y += scroll_area->priv->y_offset;
+#endif
+
+ event.type = type;
+ event.x = x;
+ event.y = y;
+
+ func (scroll_area, &event, data);
+}
+
+#if 0
+static void
+print_path (const char *header,
+ cairo_path_t *path)
+{
+ int i;
+
+ g_print ("%s\n", header);
+
+ for (i=0; i < path->num_data; i += path->data[i].header.length)
+ {
+ cairo_path_data_t *data = &(path->data[i]);
+
+ switch (data->header.type)
+ {
+ case CAIRO_PATH_MOVE_TO:
+ g_print ("move to: %f, %f\n", data[1].point.x, data[1].point.y);
+ break;
+
+ case CAIRO_PATH_LINE_TO:
+ g_print ("line to: %f, %f\n", data[1].point.x, data[1].point.y);
+ break;
+
+ case CAIRO_PATH_CURVE_TO:
+ g_print ("curve to: %f, %f\n", data[1].point.x, data[1].point.y);
+ g_print (" %f, %f\n", data[1].point.x, data[1].point.y);
+ g_print (" %f, %f\n", data[1].point.x, data[1].point.y);
+ break;
+
+ case CAIRO_PATH_CLOSE_PATH:
+ break;
+ }
+ }
+}
+#endif
+
+static void
+process_event (FooScrollArea *scroll_area,
+ FooScrollAreaEventType input_type,
+ int x,
+ int y)
+{
+ GtkWidget *widget = GTK_WIDGET (scroll_area);
+ int i;
+
+ allocation_to_canvas (scroll_area, &x, &y);
+
+ if (scroll_area->priv->grabbed)
+ {
+ emit_input (scroll_area, input_type, x, y,
+ scroll_area->priv->grab_func,
+ scroll_area->priv->grab_data);
+ return;
+ }
+
+
+#if 0
+ x += widget->allocation.x;
+ y += widget->allocation.y;
+#endif
+
+#if 0
+ g_print ("number of input regions: %d\n", scroll_area->priv->input_regions->len);
+#endif
+
+ for (i = 0; i < scroll_area->priv->input_regions->len; ++i)
+ {
+ InputRegion *region = scroll_area->priv->input_regions->pdata[i];
+
+#if 0
+ g_print ("%d ", i);
+ print_region ("region:", region->region);
+#endif
+
+ if (gdk_region_point_in (region->region, x, y))
+ {
+ InputPath *path;
+
+ path = region->paths;
+ while (path)
+ {
+ cairo_t *cr;
+ gboolean inside;
+
+ cr = gdk_cairo_create (gtk_widget_get_window (widget));
+ cairo_set_fill_rule (cr, path->fill_rule);
+ cairo_set_line_width (cr, path->line_width);
+ cairo_append_path (cr, path->path);
+
+ if (path->is_stroke)
+ inside = cairo_in_stroke (cr, x, y);
+ else
+ inside = cairo_in_fill (cr, x, y);
+
+ cairo_destroy (cr);
+
+ if (inside)
+ {
+ emit_input (scroll_area, input_type,
+ x, y,
+ path->func,
+ path->data);
+ return;
+ }
+
+ path = path->next;
+ }
+
+ /* Since the regions are all disjoint, no other region
+ * can match. Of course we could be clever and try and
+ * sort the regions, but so far I have been unable to
+ * make this loop show up on a profile.
+ */
+ return;
+ }
+ }
+}
+
+static void
+process_gdk_event (FooScrollArea *scroll_area,
+ int x,
+ int y,
+ GdkEvent *event)
+{
+ FooScrollAreaEventType input_type;
+
+ if (event->type == GDK_BUTTON_PRESS)
+ input_type = FOO_BUTTON_PRESS;
+ else if (event->type == GDK_BUTTON_RELEASE)
+ input_type = FOO_BUTTON_RELEASE;
+ else if (event->type == GDK_MOTION_NOTIFY)
+ input_type = FOO_MOTION;
+ else
+ return;
+
+ process_event (scroll_area, input_type, x, y);
+}
+
+static gboolean
+foo_scroll_area_button_press (GtkWidget *widget,
+ GdkEventButton *event)
+{
+ FooScrollArea *area = FOO_SCROLL_AREA (widget);
+
+ process_gdk_event (area, event->x, event->y, (GdkEvent *)event);
+
+ return TRUE;
+}
+
+static gboolean
+foo_scroll_area_button_release (GtkWidget *widget,
+ GdkEventButton *event)
+{
+ FooScrollArea *area = FOO_SCROLL_AREA (widget);
+
+ process_gdk_event (area, event->x, event->y, (GdkEvent *)event);
+
+ return FALSE;
+}
+
+static gboolean
+foo_scroll_area_motion (GtkWidget *widget,
+ GdkEventMotion *event)
+{
+ FooScrollArea *area = FOO_SCROLL_AREA (widget);
+
+ process_gdk_event (area, event->x, event->y, (GdkEvent *)event);
+ return TRUE;
+}
+
+void
+foo_scroll_area_set_size_fixed_y (FooScrollArea *scroll_area,
+ int width,
+ int height,
+ int old_y,
+ int new_y)
+{
+ scroll_area->priv->width = width;
+ scroll_area->priv->height = height;
+
+#if 0
+ g_print ("diff: %d\n", new_y - old_y);
+#endif
+ g_object_thaw_notify (G_OBJECT (scroll_area->priv->vadj));
+ gtk_adjustment_set_value (scroll_area->priv->vadj, new_y);
+
+ set_adjustment_values (scroll_area);
+ g_object_thaw_notify (G_OBJECT (scroll_area->priv->vadj));
+}
+
+void
+foo_scroll_area_set_size (FooScrollArea *scroll_area,
+ int width,
+ int height)
+{
+ g_return_if_fail (FOO_IS_SCROLL_AREA (scroll_area));
+
+ /* FIXME: Default scroll algorithm should probably be to
+ * keep the same *area* outside the screen as before.
+ *
+ * For wrapper widgets that will do something roughly
+ * right. For widgets that don't change size, it
+ * will do the right thing. Except for idle-layouting
+ * widgets.
+ *
+ * Maybe there should be some generic support for those
+ * widgets. Can that even be done?
+ *
+ * Should we have a version of this function using
+ * fixed points?
+ */
+
+ scroll_area->priv->width = width;
+ scroll_area->priv->height = height;
+
+ set_adjustment_values (scroll_area);
+}
+
+static void
+foo_scroll_area_size_request (GtkWidget *widget,
+ GtkRequisition *requisition)
+{
+ FooScrollArea *scroll_area = FOO_SCROLL_AREA (widget);
+
+ requisition->width = scroll_area->priv->min_width;
+ requisition->height = scroll_area->priv->min_height;
+
+#if 0
+ g_print ("request %d %d\n", requisition->width, requisition->height);
+#endif
+}
+
+#if 0
+static void
+translate_point (double *x, double *y, gpointer data)
+{
+ int *translation = data;
+
+ *x += translation[0];
+ *y += translation[1];
+}
+#endif
+
+#if 0
+static void
+path_translate (cairo_path_t *path,
+ int dx,
+ int dy)
+{
+ int translation[2] = {dx, dy};
+
+ path_foreach_point (path, translate_point, translation);
+}
+#endif
+
+static void
+translate_input_regions (FooScrollArea *scroll_area,
+ int dx,
+ int dy)
+{
+#if 0
+ int i;
+
+ for (i = 0; i < scroll_area->priv->input_regions->len; ++i)
+ {
+ InputRegion *region = scroll_area->priv->input_regions->pdata[i];
+ InputPath *path;
+
+ gdk_region_offset (region->region, dx, dy);
+
+ path = region->paths;
+ while (path != NULL)
+ {
+ path_translate (path->path, dx, dy);
+ path = path->next;
+ }
+ }
+#endif
+}
+
+#if 0
+static void
+paint_region (FooScrollArea *area, GdkRegion *region)
+{
+ int n_rects;
+ GdkRectangle *rects;
+ region = gdk_region_copy (region);
+
+ gdk_region_get_rectangles (region, &rects, &n_rects);
+
+ gdk_region_offset (region,
+ GTK_WIDGET (area)->allocation.x,
+ GTK_WIDGET (area)->allocation.y);
+
+ GdkGC *gc = gdk_gc_new (GTK_WIDGET (area)->window);
+ gdk_gc_set_clip_region (gc, region);
+ gdk_draw_rectangle (GTK_WIDGET (area)->window, gc, TRUE, 0, 0, -1, -1);
+ g_object_unref (gc);
+ g_free (rects);
+}
+#endif
+
+static void
+foo_scroll_area_scroll (FooScrollArea *area,
+ gint dx,
+ gint dy)
+{
+ GdkRectangle allocation;
+ GdkRectangle src_area;
+ GdkRectangle move_area;
+ GdkRegion *invalid_region;
+
+ gtk_widget_get_allocation (GTK_WIDGET (area), &allocation);
+ allocation.x = 0;
+ allocation.y = 0;
+
+ src_area = allocation;
+ src_area.x -= dx;
+ src_area.y -= dy;
+
+ invalid_region = gdk_region_rectangle (&allocation);
+
+ if (gdk_rectangle_intersect (&allocation, &src_area, &move_area))
+ {
+ GdkRegion *move_region;
+
+#if 0
+ g_print ("scrolling %d %d %d %d (%d %d)\n",
+ move_area.x, move_area.y,
+ move_area.width, move_area.height,
+ dx, dy);
+#endif
+
+ simple_draw_drawable (area->priv->pixmap, area->priv->pixmap,
+ move_area.x, move_area.y,
+ move_area.x + dx, move_area.y + dy,
+ move_area.width, move_area.height);
+ gtk_widget_queue_draw (GTK_WIDGET (area));
+
+ move_region = gdk_region_rectangle (&move_area);
+ gdk_region_offset (move_region, dx, dy);
+ gdk_region_subtract (invalid_region, move_region);
+ gdk_region_destroy (move_region);
+ }
+
+#if 0
+ paint_region (area, invalid_region);
+#endif
+
+ allocation_to_canvas_region (area, invalid_region);
+
+ foo_scroll_area_invalidate_region (area, invalid_region);
+
+ gdk_region_destroy (invalid_region);
+}
+
+static void
+foo_scrollbar_adjustment_changed (GtkAdjustment *adj,
+ FooScrollArea *scroll_area)
+{
+ GtkWidget *widget = GTK_WIDGET (scroll_area);
+ gint dx = 0;
+ gint dy = 0;
+ GdkRectangle old_viewport, new_viewport;
+
+ get_viewport (scroll_area, &old_viewport);
+
+ if (adj == scroll_area->priv->hadj)
+ {
+ /* FIXME: do we treat the offset as int or double, and,
+ * if int, how do we round?
+ */
+ dx = (int)gtk_adjustment_get_value (adj) - scroll_area->priv->x_offset;
+ scroll_area->priv->x_offset = gtk_adjustment_get_value (adj);
+ }
+ else if (adj == scroll_area->priv->vadj)
+ {
+ dy = (int)gtk_adjustment_get_value (adj) - scroll_area->priv->y_offset;
+ scroll_area->priv->y_offset = gtk_adjustment_get_value (adj);
+ }
+ else
+ {
+ g_assert_not_reached ();
+ }
+
+ if (gtk_widget_get_realized (widget))
+ {
+ foo_scroll_area_scroll (scroll_area, -dx, -dy);
+
+#if 0
+ window_scroll_area (widget->window, &widget->allocation, -dx, -dy);
+#endif
+ translate_input_regions (scroll_area, -dx, -dy);
+
+#if 0
+ gdk_window_process_updates (widget->window, TRUE);
+#endif
+ }
+
+ get_viewport (scroll_area, &new_viewport);
+
+ emit_viewport_changed (scroll_area, &new_viewport, &old_viewport);
+}
+
+static void
+set_one_adjustment (FooScrollArea *scroll_area,
+ GtkAdjustment *adjustment,
+ GtkAdjustment **location)
+{
+ g_return_if_fail (location != NULL);
+
+ if (adjustment == *location)
+ return;
+
+ if (!adjustment)
+ adjustment = new_adjustment ();
+
+ g_return_if_fail (GTK_IS_ADJUSTMENT (adjustment));
+
+ if (*location)
+ {
+ g_signal_handlers_disconnect_by_func (
+ *location, foo_scrollbar_adjustment_changed, scroll_area);
+
+ g_object_unref (*location);
+ }
+
+ *location = adjustment;
+
+ g_object_ref_sink (*location);
+
+ g_signal_connect (*location, "value_changed",
+ G_CALLBACK (foo_scrollbar_adjustment_changed),
+ scroll_area);
+}
+
+static void
+foo_scroll_area_set_scroll_adjustments (FooScrollArea *scroll_area,
+ GtkAdjustment *hadjustment,
+ GtkAdjustment *vadjustment)
+{
+ set_one_adjustment (scroll_area, hadjustment, &scroll_area->priv->hadj);
+ set_one_adjustment (scroll_area, vadjustment, &scroll_area->priv->vadj);
+
+ set_adjustment_values (scroll_area);
+}
+
+FooScrollArea *
+foo_scroll_area_new (void)
+{
+ return g_object_new (FOO_TYPE_SCROLL_AREA, NULL);
+}
+
+void
+foo_scroll_area_set_min_size (FooScrollArea *scroll_area,
+ int min_width,
+ int min_height)
+{
+ scroll_area->priv->min_width = min_width;
+ scroll_area->priv->min_height = min_height;
+
+ /* FIXME: think through invalidation.
+ *
+ * Goals: - no repainting everything on size_allocate(),
+ * - make sure input boxes are invalidated when
+ * needed
+ */
+ gtk_widget_queue_resize (GTK_WIDGET (scroll_area));
+}
+
+#if 0
+static void
+warn_about_adding_input_outside_expose (const char *func)
+{
+ static gboolean warned = FALSE;
+
+ if (!warned)
+ {
+ g_warning ("%s() can only be called "
+ "from the paint handler for the FooScrollArea\n", func);
+
+ warned = TRUE;
+ }
+}
+#endif
+
+static void
+user_to_device (double *x, double *y,
+ gpointer data)
+{
+ cairo_t *cr = data;
+
+ cairo_user_to_device (cr, x, y);
+}
+
+static InputPath *
+make_path (FooScrollArea *area,
+ cairo_t *cr,
+ gboolean is_stroke,
+ FooScrollAreaEventFunc func,
+ gpointer data)
+{
+ InputPath *path = g_new0 (InputPath, 1);
+
+ path->is_stroke = is_stroke;
+ path->fill_rule = cairo_get_fill_rule (cr);
+ path->line_width = cairo_get_line_width (cr);
+ path->path = cairo_copy_path (cr);
+ path_foreach_point (path->path, user_to_device, cr);
+ path->func = func;
+ path->data = data;
+ path->next = area->priv->current_input->paths;
+ area->priv->current_input->paths = path;
+ return path;
+}
+
+/* FIXME: we probably really want a
+ *
+ * foo_scroll_area_add_input_from_fill (area, cr, ...);
+ * and
+ * foo_scroll_area_add_input_from_stroke (area, cr, ...);
+ * as well.
+ */
+void
+foo_scroll_area_add_input_from_fill (FooScrollArea *scroll_area,
+ cairo_t *cr,
+ FooScrollAreaEventFunc func,
+ gpointer data)
+{
+ g_return_if_fail (FOO_IS_SCROLL_AREA (scroll_area));
+ g_return_if_fail (cr != NULL);
+ g_return_if_fail (scroll_area->priv->current_input);
+
+ make_path (scroll_area, cr, FALSE, func, data);
+}
+
+void
+foo_scroll_area_add_input_from_stroke (FooScrollArea *scroll_area,
+ cairo_t *cr,
+ FooScrollAreaEventFunc func,
+ gpointer data)
+{
+ g_return_if_fail (FOO_IS_SCROLL_AREA (scroll_area));
+ g_return_if_fail (cr != NULL);
+ g_return_if_fail (scroll_area->priv->current_input);
+
+ make_path (scroll_area, cr, TRUE, func, data);
+}
+
+void
+foo_scroll_area_invalidate (FooScrollArea *scroll_area)
+{
+ GtkAllocation allocation;
+ GtkWidget *widget = GTK_WIDGET (scroll_area);
+
+ gtk_widget_get_allocation (widget, &allocation);
+ foo_scroll_area_invalidate_rect (scroll_area,
+ scroll_area->priv->x_offset, scroll_area->priv->y_offset,
+ allocation.width,
+ allocation.height);
+}
+
+static void
+canvas_to_window (FooScrollArea *area,
+ GdkRegion *region)
+{
+ GtkAllocation allocation;
+ GtkWidget *widget = GTK_WIDGET (area);
+
+ gtk_widget_get_allocation (widget, &allocation);
+ gdk_region_offset (region,
+ -area->priv->x_offset + allocation.x,
+ -area->priv->y_offset + allocation.y);
+}
+
+static void
+window_to_canvas (FooScrollArea *area,
+ GdkRegion *region)
+{
+ GtkAllocation allocation;
+ GtkWidget *widget = GTK_WIDGET (area);
+
+ gtk_widget_get_allocation (widget, &allocation);
+ gdk_region_offset (region,
+ area->priv->x_offset - allocation.x,
+ area->priv->y_offset - allocation.y);
+}
+
+void
+foo_scroll_area_invalidate_region (FooScrollArea *area,
+ GdkRegion *region)
+{
+ GtkWidget *widget;
+
+ g_return_if_fail (FOO_IS_SCROLL_AREA (area));
+
+ widget = GTK_WIDGET (area);
+
+ gdk_region_union (area->priv->update_region, region);
+
+ if (gtk_widget_get_realized (widget))
+ {
+ canvas_to_window (area, region);
+
+ gdk_window_invalidate_region (gtk_widget_get_window (widget),
+ region, TRUE);
+
+ window_to_canvas (area, region);
+ }
+}
+
+void
+foo_scroll_area_invalidate_rect (FooScrollArea *scroll_area,
+ int x,
+ int y,
+ int width,
+ int height)
+{
+ GdkRectangle rect = { x, y, width, height };
+ GdkRegion *region;
+
+ g_return_if_fail (FOO_IS_SCROLL_AREA (scroll_area));
+
+ region = gdk_region_rectangle (&rect);
+
+ foo_scroll_area_invalidate_region (scroll_area, region);
+
+ gdk_region_destroy (region);
+}
+
+void
+foo_scroll_area_begin_grab (FooScrollArea *scroll_area,
+ FooScrollAreaEventFunc func,
+ gpointer input_data)
+{
+ g_return_if_fail (FOO_IS_SCROLL_AREA (scroll_area));
+ g_return_if_fail (!scroll_area->priv->grabbed);
+
+ scroll_area->priv->grabbed = TRUE;
+ scroll_area->priv->grab_func = func;
+ scroll_area->priv->grab_data = input_data;
+
+ /* FIXME: we should probably take a server grab */
+ /* Also, maybe there should be support for setting the grab cursor */
+}
+
+void
+foo_scroll_area_end_grab (FooScrollArea *scroll_area)
+{
+ g_return_if_fail (FOO_IS_SCROLL_AREA (scroll_area));
+
+ scroll_area->priv->grabbed = FALSE;
+ scroll_area->priv->grab_func = NULL;
+ scroll_area->priv->grab_data = NULL;
+}
+
+gboolean
+foo_scroll_area_is_grabbed (FooScrollArea *scroll_area)
+{
+ return scroll_area->priv->grabbed;
+}
+
+void
+foo_scroll_area_set_viewport_pos (FooScrollArea *scroll_area,
+ int x,
+ int y)
+{
+ g_object_freeze_notify (G_OBJECT (scroll_area->priv->hadj));
+ g_object_freeze_notify (G_OBJECT (scroll_area->priv->vadj));
+ gtk_adjustment_set_value (scroll_area->priv->hadj, x);
+ gtk_adjustment_set_value (scroll_area->priv->vadj, y);
+
+ set_adjustment_values (scroll_area);
+ g_object_thaw_notify (G_OBJECT (scroll_area->priv->hadj));
+ g_object_thaw_notify (G_OBJECT (scroll_area->priv->vadj));
+}
+
+static gboolean
+rect_contains (const GdkRectangle *rect, int x, int y)
+{
+ return (x >= rect->x &&
+ y >= rect->y &&
+ x < rect->x + rect->width &&
+ y < rect->y + rect->height);
+}
+
+static void
+stop_scrolling (FooScrollArea *area)
+{
+#if 0
+ g_print ("stop scrolling\n");
+#endif
+ if (area->priv->auto_scroll_info)
+ {
+ g_source_remove (area->priv->auto_scroll_info->timeout_id);
+ g_timer_destroy (area->priv->auto_scroll_info->timer);
+ g_free (area->priv->auto_scroll_info);
+
+ area->priv->auto_scroll_info = NULL;
+ }
+}
+
+static gboolean
+scroll_idle (gpointer data)
+{
+ GdkRectangle viewport, new_viewport;
+ FooScrollArea *area = data;
+ AutoScrollInfo *info = area->priv->auto_scroll_info;
+#if 0
+ int dx, dy;
+#endif
+ int new_x, new_y;
+ double elapsed;
+
+ get_viewport (area, &viewport);
+
+#if 0
+ g_print ("old info: %d %d\n", info->dx, info->dy);
+
+ g_print ("timeout (%d %d)\n", dx, dy);
+#endif
+
+#if 0
+ viewport.x += info->dx;
+ viewport.y += info->dy;
+#endif
+
+#if 0
+ g_print ("new info %d %d\n", info->dx, info->dy);
+#endif
+
+ elapsed = g_timer_elapsed (info->timer, NULL);
+
+ info->res_x = elapsed * info->dx / 0.2;
+ info->res_y = elapsed * info->dy / 0.2;
+
+#if 0
+ g_print ("%f %f\n", info->res_x, info->res_y);
+#endif
+
+ new_x = viewport.x + info->res_x;
+ new_y = viewport.y + info->res_y;
+
+#if 0
+ g_print ("%f\n", elapsed * (info->dx / 0.2));
+#endif
+
+#if 0
+ g_print ("new_x, new_y\n: %d %d\n", new_x, new_y);
+#endif
+
+ foo_scroll_area_set_viewport_pos (area, new_x, new_y);
+#if 0
+ viewport.x + info->dx,
+ viewport.y + info->dy);
+#endif
+
+ get_viewport (area, &new_viewport);
+
+ if (viewport.x == new_viewport.x &&
+ viewport.y == new_viewport.y &&
+ (info->res_x > 1.0 ||
+ info->res_y > 1.0 ||
+ info->res_x < -1.0 ||
+ info->res_y < -1.0))
+ {
+ stop_scrolling (area);
+
+ /* stop scrolling if it didn't have an effect */
+ return FALSE;
+ }
+
+ return TRUE;
+}
+
+static void
+ensure_scrolling (FooScrollArea *area,
+ int dx,
+ int dy)
+{
+ if (!area->priv->auto_scroll_info)
+ {
+#if 0
+ g_print ("start scrolling\n");
+#endif
+ area->priv->auto_scroll_info = g_new0 (AutoScrollInfo, 1);
+ area->priv->auto_scroll_info->timeout_id =
+ g_idle_add (scroll_idle, area);
+ area->priv->auto_scroll_info->timer = g_timer_new ();
+ }
+
+#if 0
+ g_print ("setting scrolling to %d %d\n", dx, dy);
+#endif
+
+#if 0
+ g_print ("dx, dy: %d %d\n", dx, dy);
+#endif
+
+ area->priv->auto_scroll_info->dx = dx;
+ area->priv->auto_scroll_info->dy = dy;
+}
+
+void
+foo_scroll_area_auto_scroll (FooScrollArea *scroll_area,
+ FooScrollAreaEvent *event)
+{
+ GdkRectangle viewport;
+
+ get_viewport (scroll_area, &viewport);
+
+ if (rect_contains (&viewport, event->x, event->y))
+ {
+ stop_scrolling (scroll_area);
+ }
+ else
+ {
+ int dx, dy;
+
+ dx = dy = 0;
+
+ if (event->y < viewport.y)
+ {
+ dy = event->y - viewport.y;
+ dy = MIN (dy + 2, 0);
+ }
+ else if (event->y >= viewport.y + viewport.height)
+ {
+ dy = event->y - (viewport.y + viewport.height - 1);
+ dy = MAX (dy - 2, 0);
+ }
+
+ if (event->x < viewport.x)
+ {
+ dx = event->x - viewport.x;
+ dx = MIN (dx + 2, 0);
+ }
+ else if (event->x >= viewport.x + viewport.width)
+ {
+ dx = event->x - (viewport.x + viewport.width - 1);
+ dx = MAX (dx - 2, 0);
+ }
+
+#if 0
+ g_print ("dx, dy: %d %d\n", dx, dy);
+#endif
+
+ ensure_scrolling (scroll_area, dx, dy);
+ }
+}
+
+void
+foo_scroll_area_begin_auto_scroll (FooScrollArea *scroll_area)
+{
+ /* noop for now */
+}
+
+void
+foo_scroll_area_end_auto_scroll (FooScrollArea *scroll_area)
+{
+ stop_scrolling (scroll_area);
+}
+
+
+
+#if 0
+/*
+ * Backing Store
+ */
+struct BackingStore
+{
+ GdkPixmap *pixmap;
+ GdkRegion *update_region;
+ int width;
+ int height;
+};
+
+static BackingStore *
+backing_store_new (GdkWindow *window,
+ int width, int height)
+{
+ BackingStore *store = g_new0 (BackingStore, 1);
+ GdkRectangle rect = { 0, 0, width, height };
+
+ store->pixmap = gdk_pixmap_new (window, width, height, -1);
+ store->update_region = gdk_region_rectangle (&rect);
+ store->width = width;
+ store->height = height;
+
+ return store;
+}
+
+static void
+backing_store_free (BackingStore *store)
+{
+ g_object_unref (store->pixmap);
+ gdk_region_destroy (store->update_region);
+ g_free (store);
+}
+
+static void
+backing_store_draw (BackingStore *store,
+ GdkDrawable *dest,
+ GdkRegion *clip,
+ int x,
+ int y)
+{
+ GdkGC *gc = gdk_gc_new (dest);
+
+ gdk_gc_set_clip_region (gc, clip);
+
+ gdk_draw_drawable (dest, gc, store->pixmap,
+ 0, 0, x, y, store->width, store->height);
+
+ g_object_unref (gc);
+}
+
+static void
+backing_store_scroll (BackingStore *store,
+ int dx,
+ int dy)
+{
+ GdkGC *gc = gdk_gc_new (store->pixmap);
+ GdkRectangle rect;
+
+ gdk_draw_drawable (store->pixmap, gc, store->pixmap,
+ 0, 0, dx, dy,
+ store->width, store->height);
+
+ /* Invalidate vertically */
+ rect.x = 0;
+ rect.width = store->width;
+
+ if (dy > 0)
+ {
+ rect.y = 0;
+ rect.height = dy;
+ }
+ else
+ {
+ rect.y = store->height + dy;
+ rect.y = -dy;
+ }
+
+ gdk_region_union_with_rect (store->update_region, &rect);
+
+ /* Invalidate horizontally */
+ rect.y = 0;
+ rect.height = store->height;
+
+ if (dx > 0)
+ {
+ rect.x = 0;
+ rect.width = dx;
+ }
+ else
+ {
+ rect.x = store->width + dx;
+ rect.width = -dx;
+ }
+
+ gdk_region_union_with_rect (store->update_region, &rect);
+}
+
+static void
+backing_store_invalidate_rect (BackingStore *store,
+ GdkRectangle *rect)
+{
+ gdk_region_union_with_rect (store->update_region, rect);
+}
+
+static void
+backing_store_invalidate_region (BackingStore *store,
+ GdkRegion *region)
+{
+ gdk_region_union (store->update_region, region);
+}
+
+static void
+backing_store_invalidate_all (BackingStore *store)
+{
+ GdkRectangle rect = { 0, 0, store->width, store->height };
+ gdk_region_destroy (store->update_region);
+ store->update_region = gdk_region_rectangle (&rect);
+}
+
+static void
+backing_store_resize (BackingStore *store,
+ int width,
+ int height)
+{
+ GdkPixmap *pixmap = gdk_pixmap_new (store->pixmap, width, height, -1);
+
+ /* Unfortunately we don't know in which direction we were resized,
+ * so we just assume we were dragged from the south-east corner.
+ *
+ * Although, maybe we could get the root coordinates of the input-window?
+ * That might just work, actually. We need to make sure marco uses
+ * static gravity for the window before this will be useful.
+ */
+ simple_draw_drawable (pixmap, store->pixmap, 0, 0, 0, 0, -1, -1);
+
+ g_object_unref (store->pixmap);
+
+ store->pixmap = pixmap;
+
+ /* FIXME: invalidate uncovered strip only */
+
+ backing_store_invalidate_all (store);
+}
+
+static void
+cclip_to_region (cairo_t *cr, GdkRegion *region)
+{
+ int n_rects;
+ GdkRectangle *rects;
+
+ gdk_region_get_rectangles (region, &rects, &n_rects);
+
+ cairo_new_path (cr);
+ while (n_rects--)
+ {
+ GdkRectangle *rect = &(rects[n_rects]);
+
+ cairo_rectangle (cr, rect->x, rect->y, rect->width, rect->height);
+ }
+ cairo_clip (cr);
+
+ g_free (rects);
+}
+
+static void
+backing_store_process_updates (BackingStore *store,
+ ExposeFunc func,
+ gpointer data)
+{
+ cairo_t *cr = gdk_cairo_create (store->pixmap);
+ GdkRegion *region = store->update_region;
+ store->update_region = gdk_region_new ();
+
+ cclip_to_region (cr, store->update_region);
+
+ func (cr, store->update_region, data);
+
+ gdk_region_destroy (region);
+ cairo_destroy (cr);
+}
+
+#endif
generated by cgit v1.2.1 (git 2.18.0) at 2024-07-03 18:12:52 +0000