mirror of
https://gitlab.gnome.org/GNOME/gtk.git
synced 2024-12-28 14:31:10 +00:00
251 lines
7.5 KiB
C
251 lines
7.5 KiB
C
/* foreign-drawing.c
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* Copyright (C) 2015 Red Hat, Inc
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* Author: Matthias Clasen
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <gtk/gtk.h>
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typedef struct {
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GType type;
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const gchar *name;
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const gchar *class1;
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const gchar *class2;
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} PathElt;
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static GtkStyleContext *
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get_style (PathElt *pelt, GtkStyleContext *parent)
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{
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GtkWidgetPath *path;
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GtkStyleContext *context;
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if (parent)
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path = gtk_widget_path_copy (gtk_style_context_get_path (parent));
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else
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path = gtk_widget_path_new ();
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gtk_widget_path_append_type (path, pelt->type);
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if (pelt->name)
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gtk_widget_path_iter_set_object_name (path, -1, pelt->name);
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if (pelt->class1)
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gtk_widget_path_iter_add_class (path, -1, pelt->class1);
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if (pelt->class2)
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gtk_widget_path_iter_add_class (path, -1, pelt->class2);
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context = gtk_style_context_new ();
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gtk_style_context_set_path (context, path);
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gtk_style_context_set_parent (context, parent);
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gtk_widget_path_unref (path);
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return context;
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}
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static void
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draw_horizontal_scrollbar (GtkWidget *widget,
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cairo_t *cr,
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gint x,
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gint y,
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gint width,
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gint height,
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gint position,
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GtkStateFlags state)
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{
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GtkStyleContext *scrollbar_context;
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GtkStyleContext *trough_context;
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GtkStyleContext *slider_context;
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/* This information is taken from the GtkScrollbar docs, see "CSS nodes" */
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PathElt path[3] = {
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{ GTK_TYPE_SCROLLBAR, "scrollbar", "horizontal", NULL },
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{ G_TYPE_NONE, "trough", NULL, NULL },
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{ G_TYPE_NONE, "slider", NULL, NULL }
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};
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scrollbar_context = get_style (&path[0], NULL);
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trough_context = get_style (&path[1], scrollbar_context);
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slider_context = get_style (&path[2], trough_context);
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gtk_style_context_set_state (scrollbar_context, state);
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gtk_style_context_set_state (trough_context, state);
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gtk_style_context_set_state (slider_context, state);
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gtk_render_background (trough_context, cr, x, y, width, height);
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gtk_render_frame (trough_context, cr, x, y, width, height);
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gtk_render_slider (slider_context, cr, x + position, y + 1, 30, height - 2, GTK_ORIENTATION_HORIZONTAL);
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g_object_unref (slider_context);
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g_object_unref (trough_context);
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g_object_unref (scrollbar_context);
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}
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static void
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draw_text (GtkWidget *widget,
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cairo_t *cr,
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gint x,
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gint y,
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gint width,
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gint height,
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const gchar *text,
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GtkStateFlags state)
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{
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GtkStyleContext *label_context;
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GtkStyleContext *selection_context;
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GtkStyleContext *context;
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PangoLayout *layout;
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/* This information is taken from the GtkLabel docs, see "CSS nodes" */
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PathElt path[2] = {
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{ GTK_TYPE_LABEL, "label", "view", NULL },
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{ G_TYPE_NONE, "selection", NULL, NULL }
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};
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label_context = get_style (&path[0], NULL);
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selection_context = get_style (&path[1], label_context);
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gtk_style_context_set_state (label_context, state);
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if (state & GTK_STATE_FLAG_SELECTED)
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context = selection_context;
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else
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context = label_context;
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layout = gtk_widget_create_pango_layout (widget, text);
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gtk_render_background (context, cr, x, y, width, height);
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gtk_render_frame (context, cr, x, y, width, height);
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gtk_render_layout (context, cr, x, y, layout);
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g_object_unref (layout);
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g_object_unref (selection_context);
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g_object_unref (label_context);
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}
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static void
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draw_check (GtkWidget *widget,
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cairo_t *cr,
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gint x,
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gint y,
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GtkStateFlags state)
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{
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GtkStyleContext *button_context;
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GtkStyleContext *check_context;
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/* This information is taken from the GtkCheckButton docs, see "CSS nodes" */
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PathElt path[2] = {
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{ GTK_TYPE_LABEL, "checkbutton", NULL, NULL },
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{ G_TYPE_NONE, "check", NULL, NULL }
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};
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button_context = get_style (&path[0], NULL);
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check_context = get_style (&path[1], button_context);
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gtk_style_context_set_state (check_context, state);
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gtk_render_background (check_context, cr, x, y, 20, 20);
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gtk_render_frame (check_context, cr, x, y, 20, 20);
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gtk_render_check (check_context, cr, x, y, 20, 20);
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g_object_unref (check_context);
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g_object_unref (button_context);
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}
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static void
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draw_radio (GtkWidget *widget,
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cairo_t *cr,
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gint x,
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gint y,
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GtkStateFlags state)
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{
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GtkStyleContext *button_context;
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GtkStyleContext *check_context;
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/* This information is taken from the GtkRadioButton docs, see "CSS nodes" */
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PathElt path[2] = {
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{ GTK_TYPE_LABEL, "radiobutton", NULL, NULL },
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{ G_TYPE_NONE, "radio", NULL, NULL }
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};
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button_context = get_style (&path[0], NULL);
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check_context = get_style (&path[1], button_context);
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gtk_style_context_set_state (check_context, state);
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gtk_render_background (check_context, cr, x, y, 20, 20);
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gtk_render_frame (check_context, cr, x, y, 20, 20);
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gtk_render_option (check_context, cr, x, y, 20, 20);
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g_object_unref (check_context);
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g_object_unref (button_context);
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}
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static gboolean
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draw_cb (GtkWidget *widget,
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cairo_t *cr)
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{
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gint width, height;
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width = gtk_widget_get_allocated_width (widget);
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height = gtk_widget_get_allocated_height (widget);
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cairo_rectangle (cr, 0, 0, width, height);
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cairo_set_source_rgb (cr, 0, 0, 0);
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cairo_fill (cr);
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draw_horizontal_scrollbar (widget, cr, 10, 10, width - 20, 10, 30, GTK_STATE_FLAG_NORMAL);
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draw_horizontal_scrollbar (widget, cr, 10, 30, width - 20, 10, 40, GTK_STATE_FLAG_PRELIGHT);
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draw_horizontal_scrollbar (widget, cr, 10, 50, width - 20, 10, 50, GTK_STATE_FLAG_ACTIVE|GTK_STATE_FLAG_PRELIGHT);
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draw_text (widget, cr, 10, 70, width - 20, 20, "Not selected", GTK_STATE_FLAG_NORMAL);
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draw_text (widget, cr, 10, 100, width - 20, 20, "Selected", GTK_STATE_FLAG_SELECTED);
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draw_check (widget, cr, 10, 130, GTK_STATE_FLAG_NORMAL);
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draw_check (widget, cr, 40, 130, GTK_STATE_FLAG_CHECKED);
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draw_radio (widget, cr, 70, 130, GTK_STATE_FLAG_NORMAL);
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draw_radio (widget, cr, 100, 130, GTK_STATE_FLAG_CHECKED);
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return FALSE;
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}
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int
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main (int argc, char *argv[])
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{
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GtkWidget *window;
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GtkWidget *box;
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GtkWidget *da;
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gtk_init (NULL, NULL);
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window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
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box = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 10);
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gtk_container_add (GTK_CONTAINER (window), box);
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da = gtk_drawing_area_new ();
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gtk_widget_set_size_request (da, 200, 200);
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gtk_widget_set_hexpand (da, TRUE);
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gtk_widget_set_vexpand (da, TRUE);
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gtk_widget_set_app_paintable (da, TRUE);
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gtk_container_add (GTK_CONTAINER (box), da);
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g_signal_connect (da, "draw", G_CALLBACK (draw_cb), NULL);
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gtk_widget_show_all (window);
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gtk_main ();
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return 0;
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}
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