initial

1 files changed, 358 insertions, 0 deletions

diff --git a/src/math-display.c b/src/math-display.c
new file mode 100644
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--- /dev/null
+++ b/src/math-display.c
@@ -0,0 +1,358 @@
+/*  Copyright (c) 2008-2009 Robert Ancell
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2, or (at your option)
+ *  any later version.
+ *
+ *  This program 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
+ *  General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
+ *  02111-1307, USA.
+ */
+
+#include <string.h>
+#include <glib/gi18n.h>
+#include <gdk/gdkkeysyms.h>
+
+#include "math-display.h"
+
+enum {
+    PROP_0,
+    PROP_EQUATION
+};
+
+struct MathDisplayPrivate
+{
+    /* Equation being displayed */
+    MathEquation *equation;
+
+    /* Display widget */
+    GtkWidget *text_view;
+
+    /* Buffer that shows errors etc */
+    GtkTextBuffer *info_buffer;
+};
+
+G_DEFINE_TYPE (MathDisplay, math_display, GTK_TYPE_VBOX);
+
+#define GET_WIDGET(ui, name)  GTK_WIDGET(gtk_builder_get_object(ui, name))
+
+MathDisplay *
+math_display_new()
+{
+    return g_object_new (math_display_get_type(), "equation", math_equation_new(), NULL);
+}
+
+
+MathDisplay *
+math_display_new_with_equation(MathEquation *equation)
+{
+    return g_object_new (math_display_get_type(), "equation", equation, NULL);
+}
+
+
+MathEquation *
+math_display_get_equation(MathDisplay *display)
+{
+    return display->priv->equation;
+}
+
+
+static gboolean
+display_key_press_cb(GtkWidget *widget, GdkEventKey *event, MathDisplay *display)
+{
+    int state;
+    guint32 c;
+
+    state = event->state & (GDK_CONTROL_MASK | GDK_MOD1_MASK);
+    c = gdk_keyval_to_unicode(event->keyval);
+
+    /* Solve on enter */
+    if (event->keyval == GDK_Return || event->keyval == GDK_KP_Enter) {
+        math_equation_solve(display->priv->equation);
+        return TRUE;
+    }
+
+    /* Clear on escape */
+    if ((event->keyval == GDK_Escape && state == 0) ||
+        (event->keyval == GDK_BackSpace && state == GDK_CONTROL_MASK) ||
+        (event->keyval == GDK_Delete && state == GDK_SHIFT_MASK)) {
+        math_equation_clear(display->priv->equation);
+        return TRUE;
+    }
+
+    /* Substitute */
+    if (state == 0) {
+        if (c == '*') {
+            math_equation_insert(display->priv->equation, "×");
+            return TRUE;
+        }
+        if (c == '/') {
+            math_equation_insert(display->priv->equation, "÷");
+            return TRUE;
+        }
+        if (c == '-') {
+            math_equation_insert_subtract(display->priv->equation);
+            return TRUE;
+        }
+    }
+
+    /* Shortcuts */
+    if (state == GDK_CONTROL_MASK) {
+        switch(event->keyval)
+        {
+        case GDK_bracketleft:
+            math_equation_insert(display->priv->equation, "⌈");
+            return TRUE;
+        case GDK_bracketright:
+            math_equation_insert(display->priv->equation, "⌉");
+            return TRUE;
+        case GDK_e:
+            math_equation_insert_exponent(display->priv->equation);
+            return TRUE;
+        case GDK_f:
+            math_equation_factorize(display->priv->equation);
+            return TRUE;
+        case GDK_i:
+            math_equation_insert(display->priv->equation, "⁻¹");
+            return TRUE;
+        case GDK_p:
+            math_equation_insert(display->priv->equation, "π");
+            return TRUE;
+        case GDK_r:
+            math_equation_insert(display->priv->equation, "√");
+            return TRUE;
+        case GDK_u:
+            math_equation_insert(display->priv->equation, "µ");
+            return TRUE;
+        case GDK_minus:
+             math_equation_insert(display->priv->equation, "⁻");
+             return TRUE;
+        case GDK_apostrophe:
+             math_equation_insert(display->priv->equation, "°");
+             return TRUE;
+        }
+    }
+    if (state == GDK_MOD1_MASK) {
+        switch(event->keyval)
+        {
+        case GDK_bracketleft:
+            math_equation_insert(display->priv->equation, "⌊");
+            return TRUE;
+        case GDK_bracketright:
+            math_equation_insert(display->priv->equation, "⌋");
+            return TRUE;
+        }
+    }
+
+    if (state == GDK_CONTROL_MASK || math_equation_get_number_mode(display->priv->equation) == SUPERSCRIPT) {
+        switch(event->keyval)
+        {
+        case GDK_0:
+            math_equation_insert(display->priv->equation, "⁰");
+            return TRUE;
+        case GDK_1:
+            math_equation_insert(display->priv->equation, "¹");
+            return TRUE;
+        case GDK_2:
+            math_equation_insert(display->priv->equation, "²");
+            return TRUE;
+        case GDK_3:
+            math_equation_insert(display->priv->equation, "³");
+            return TRUE;
+        case GDK_4:
+            math_equation_insert(display->priv->equation, "⁴");
+            return TRUE;
+        case GDK_5:
+            math_equation_insert(display->priv->equation, "⁵");
+            return TRUE;
+        case GDK_6:
+            math_equation_insert(display->priv->equation, "⁶");
+            return TRUE;
+        case GDK_7:
+            math_equation_insert(display->priv->equation, "⁷");
+            return TRUE;
+        case GDK_8:
+            math_equation_insert(display->priv->equation, "⁸");
+            return TRUE;
+        case GDK_9:
+            math_equation_insert(display->priv->equation, "⁹");
+            return TRUE;
+        }
+    }
+    else if (state == GDK_MOD1_MASK || math_equation_get_number_mode(display->priv->equation) == SUBSCRIPT) {
+        switch(event->keyval)
+        {
+        case GDK_0:
+            math_equation_insert(display->priv->equation, "₀");
+            return TRUE;
+        case GDK_1:
+            math_equation_insert(display->priv->equation, "₁");
+            return TRUE;
+        case GDK_2:
+            math_equation_insert(display->priv->equation, "₂");
+            return TRUE;
+        case GDK_3:
+            math_equation_insert(display->priv->equation, "₃");
+            return TRUE;
+        case GDK_4:
+            math_equation_insert(display->priv->equation, "₄");
+            return TRUE;
+        case GDK_5:
+            math_equation_insert(display->priv->equation, "₅");
+            return TRUE;
+        case GDK_6:
+            math_equation_insert(display->priv->equation, "₆");
+            return TRUE;
+        case GDK_7:
+            math_equation_insert(display->priv->equation, "₇");
+            return TRUE;
+        case GDK_8:
+            math_equation_insert(display->priv->equation, "₈");
+            return TRUE;
+        case GDK_9:
+            math_equation_insert(display->priv->equation, "₉");
+            return TRUE;
+        }
+    }
+
+    return FALSE;
+}
+
+
+static gboolean
+key_press_cb(MathDisplay *display, GdkEventKey *event)
+{
+    gboolean result;
+    g_signal_emit_by_name(display->priv->text_view, "key-press-event", event, &result);
+    return result;
+}
+
+
+static void
+status_changed_cb(MathEquation *equation, GParamSpec *spec, MathDisplay *display)
+{
+    gtk_text_buffer_set_text(display->priv->info_buffer, math_equation_get_status(equation), -1);
+}
+
+
+static void
+create_gui(MathDisplay *display)
+{
+    GtkWidget *info_view;
+    PangoFontDescription *font_desc;
+  
+    g_signal_connect(display, "key-press-event", G_CALLBACK(key_press_cb), display);
+
+    display->priv->text_view = gtk_text_view_new_with_buffer(GTK_TEXT_BUFFER(display->priv->equation));
+    gtk_text_view_set_wrap_mode(GTK_TEXT_VIEW(display->priv->text_view), GTK_WRAP_WORD);
+    gtk_text_view_set_accepts_tab(GTK_TEXT_VIEW(display->priv->text_view), FALSE);
+    gtk_text_view_set_pixels_above_lines(GTK_TEXT_VIEW(display->priv->text_view), 8);
+    gtk_text_view_set_pixels_below_lines(GTK_TEXT_VIEW(display->priv->text_view), 2);
+    /* TEMP: Disabled for now as GTK+ doesn't properly render a right aligned right margin, see bug #482688 */
+    /*gtk_text_view_set_right_margin(GTK_TEXT_VIEW(display->priv->text_view), 6);*/
+    gtk_text_view_set_justification(GTK_TEXT_VIEW(display->priv->text_view), GTK_JUSTIFY_RIGHT);
+    gtk_widget_ensure_style(display->priv->text_view);
+    font_desc = pango_font_description_copy(gtk_widget_get_style(display->priv->text_view)->font_desc);
+    pango_font_description_set_size(font_desc, 16 * PANGO_SCALE);
+    gtk_widget_modify_font(display->priv->text_view, font_desc);
+    pango_font_description_free(font_desc);
+    gtk_widget_set_name(display->priv->text_view, "displayitem");
+    atk_object_set_role(gtk_widget_get_accessible(display->priv->text_view), ATK_ROLE_EDITBAR);
+  //FIXME:<property name="AtkObject::accessible-description" translatable="yes" comments="Accessible description for the area in which results are displayed">Result Region</property>
+    g_signal_connect(display->priv->text_view, "key-press-event", G_CALLBACK(display_key_press_cb), display);
+    gtk_box_pack_start(GTK_BOX(display), display->priv->text_view, TRUE, TRUE, 0);
+  
+    info_view = gtk_text_view_new();
+    gtk_text_view_set_wrap_mode(GTK_TEXT_VIEW(info_view), GTK_WRAP_WORD);
+    gtk_widget_set_can_focus(info_view, TRUE); // FIXME: This should be FALSE but it locks the cursor inside the main view for some reason
+    gtk_text_view_set_cursor_visible(GTK_TEXT_VIEW(info_view), FALSE); // FIXME: Just here so when incorrectly gets focus doesn't look editable
+    gtk_text_view_set_editable(GTK_TEXT_VIEW(info_view), FALSE);
+    gtk_text_view_set_justification(GTK_TEXT_VIEW(info_view), GTK_JUSTIFY_RIGHT);
+    /* TEMP: Disabled for now as GTK+ doesn't properly render a right aligned right margin, see bug #482688 */
+    /*gtk_text_view_set_right_margin(GTK_TEXT_VIEW(info_view), 6);*/
+    gtk_box_pack_start(GTK_BOX(display), info_view, FALSE, TRUE, 0);
+    display->priv->info_buffer = gtk_text_view_get_buffer(GTK_TEXT_VIEW(info_view));
+
+    gtk_widget_show(info_view);
+    gtk_widget_show(display->priv->text_view);
+
+    g_signal_connect(display->priv->equation, "notify::status", G_CALLBACK(status_changed_cb), display);
+    status_changed_cb(display->priv->equation, NULL, display);
+}
+
+
+static void
+math_display_set_property(GObject      *object,
+                          guint         prop_id,
+                          const GValue *value,
+                          GParamSpec   *pspec)
+{
+    MathDisplay *self;
+
+    self = MATH_DISPLAY (object);
+
+    switch (prop_id) {
+    case PROP_EQUATION:
+        self->priv->equation = g_value_get_object (value);
+        create_gui(self);
+        break;
+    default:
+        G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+        break;
+    }
+}
+
+
+static void
+math_display_get_property(GObject    *object,
+                          guint       prop_id,
+                          GValue     *value,
+                          GParamSpec *pspec)
+{
+    MathDisplay *self;
+
+    self = MATH_DISPLAY (object);
+
+    switch (prop_id) {
+    case PROP_EQUATION:
+        g_value_set_object (value, self->priv->equation);
+        break;
+    default:
+        G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+        break;
+    }
+}
+
+
+static void
+math_display_class_init (MathDisplayClass *klass)
+{
+    GObjectClass *object_class = G_OBJECT_CLASS (klass);
+
+    object_class->get_property = math_display_get_property;
+    object_class->set_property = math_display_set_property;
+
+    g_type_class_add_private (klass, sizeof (MathDisplayPrivate));
+
+    g_object_class_install_property(object_class,
+                                    PROP_EQUATION,
+                                    g_param_spec_object("equation",
+                                                        "equation",
+                                                        "Equation being displayed",
+                                                        math_equation_get_type(),
+                                                        G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY));
+}
+
+
+static void 
+math_display_init(MathDisplay *display)
+{
+    display->priv = G_TYPE_INSTANCE_GET_PRIVATE (display, math_display_get_type(), MathDisplayPrivate);
+}