mirror of
https://gitlab.gnome.org/GNOME/gtk.git
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609e04ddcf
Clean up the code of many examples in minor ways, fix some memory leaks, and avoid the use of dialogs where a regular toplevel works just as well.
117 lines
3.0 KiB
C
117 lines
3.0 KiB
C
/* Color Chooser
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*
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* A GtkColorChooser lets the user choose a color. There are several
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* implementations of the GtkColorChooser interface in GTK+. The
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* GtkColorChooserDialog is a prebuilt dialog containing a
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* GtkColorChooserWidget.
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*/
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#include <gtk/gtk.h>
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static GtkWidget *window = NULL;
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static GtkWidget *da;
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static GdkRGBA color;
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static GtkWidget *frame;
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/* draw callback for the drawing area
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*/
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static gboolean
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draw_callback (GtkWidget *widget,
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cairo_t *cr,
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gpointer data)
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{
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gdk_cairo_set_source_rgba (cr, &color);
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cairo_paint (cr);
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return TRUE;
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}
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static void
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response_cb (GtkDialog *dialog,
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gint response_id,
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gpointer user_data)
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{
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if (response_id == GTK_RESPONSE_OK)
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gtk_color_chooser_get_rgba (GTK_COLOR_CHOOSER (dialog), &color);
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gtk_widget_destroy (GTK_WIDGET (dialog));
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}
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static void
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change_color_callback (GtkWidget *button,
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gpointer data)
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{
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GtkWidget *dialog;
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dialog = gtk_color_chooser_dialog_new ("Changing color", GTK_WINDOW (window));
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gtk_window_set_modal (GTK_WINDOW (dialog), TRUE);
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gtk_color_chooser_set_rgba (GTK_COLOR_CHOOSER (dialog), &color);
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g_signal_connect (dialog, "response",
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G_CALLBACK (response_cb), NULL);
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gtk_widget_show_all (dialog);
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}
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GtkWidget *
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do_colorsel (GtkWidget *do_widget)
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{
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GtkWidget *vbox;
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GtkWidget *button;
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if (!window)
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{
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color.red = 0;
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color.blue = 1;
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color.green = 0;
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color.alpha = 1;
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window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
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gtk_window_set_screen (GTK_WINDOW (window),
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gtk_widget_get_screen (do_widget));
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gtk_window_set_title (GTK_WINDOW (window), "Color Chooser");
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g_signal_connect (window, "destroy",
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G_CALLBACK (gtk_widget_destroyed), &window);
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gtk_container_set_border_width (GTK_CONTAINER (window), 8);
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vbox = gtk_box_new (GTK_ORIENTATION_VERTICAL, 8);
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gtk_container_set_border_width (GTK_CONTAINER (vbox), 8);
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gtk_container_add (GTK_CONTAINER (window), vbox);
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/*
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* Create the color swatch area
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*/
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frame = gtk_frame_new (NULL);
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gtk_frame_set_shadow_type (GTK_FRAME (frame), GTK_SHADOW_IN);
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gtk_box_pack_start (GTK_BOX (vbox), frame, TRUE, TRUE, 0);
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da = gtk_drawing_area_new ();
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g_signal_connect (da, "draw", G_CALLBACK (draw_callback), NULL);
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/* set a minimum size */
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gtk_widget_set_size_request (da, 200, 200);
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gtk_container_add (GTK_CONTAINER (frame), da);
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button = gtk_button_new_with_mnemonic ("_Change the above color");
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gtk_widget_set_halign (button, GTK_ALIGN_END);
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gtk_widget_set_valign (button, GTK_ALIGN_CENTER);
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gtk_box_pack_start (GTK_BOX (vbox), button, FALSE, FALSE, 0);
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g_signal_connect (button, "clicked",
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G_CALLBACK (change_color_callback), NULL);
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}
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if (!gtk_widget_get_visible (window))
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gtk_widget_show_all (window);
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else
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gtk_widget_destroy (window);
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return window;
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}
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