/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
/* Metacity tile-preview marks the area a window will *ehm* snap to */
/*
* Copyright (C) 2010 Florian Müllner
*
* 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 of the
* License, 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, see .
*/
#include
#include
#include
#include "tile-preview.h"
#include "core.h"
#define OUTLINE_WIDTH 5 /* frame width in non-composite case */
struct _MetaTilePreview {
GtkWidget *preview_window;
GdkRGBA *preview_color;
MetaRectangle tile_rect;
gboolean has_alpha: 1;
};
static gboolean
meta_tile_preview_draw (GtkWidget *widget,
cairo_t *cr,
gpointer user_data)
{
MetaTilePreview *preview = user_data;
cairo_set_line_width (cr, 1.0);
if (preview->has_alpha)
{
GdkRGBA preview_color = *preview->preview_color;
/* Fill the preview area with a transparent color */
gdk_cairo_set_source_rgba (cr, &preview_color);
cairo_set_operator (cr, CAIRO_OPERATOR_SOURCE);
cairo_paint (cr);
/* Use the opaque color for the border */
preview_color.alpha = 1.0;
gdk_cairo_set_source_rgba (cr, &preview_color);
}
else
{
GdkRGBA white = {1.0, 1.0, 1.0, 1.0};
gdk_cairo_set_source_rgba (cr, &white);
cairo_rectangle (cr,
OUTLINE_WIDTH - 0.5, OUTLINE_WIDTH - 0.5,
preview->tile_rect.width - 2 * (OUTLINE_WIDTH - 1) - 1,
preview->tile_rect.height - 2 * (OUTLINE_WIDTH - 1) - 1);
cairo_stroke (cr);
}
cairo_rectangle (cr,
0.5, 0.5,
preview->tile_rect.width - 1,
preview->tile_rect.height - 1);
cairo_stroke (cr);
return FALSE;
}
static void
meta_tile_preview_style_updated (GtkWidget *widget,
gpointer user_data)
{
MetaTilePreview *preview;
GtkWidgetPath *path;
GtkStyleContext *context;
guchar alpha;
preview = (MetaTilePreview *) user_data;
path = gtk_widget_path_new ();
context = gtk_style_context_new ();
alpha = 0xFF;
gtk_widget_path_append_type (path, GTK_TYPE_ICON_VIEW);
gtk_style_context_set_path (context, path);
gtk_style_context_set_state (context, GTK_STATE_FLAG_SELECTED);
gtk_style_context_get (context, GTK_STATE_FLAG_SELECTED,
"background-color", &preview->preview_color,
NULL);
gtk_style_context_get_style (context, "selection-box-alpha", &alpha, NULL);
preview->preview_color->alpha = (double)alpha / 0xFF;
gtk_widget_path_free (path);
g_object_unref (context);
}
static void
meta_tile_preview_composited_changed (GtkWidget *widget,
gpointer user_data)
{
MetaTilePreview *preview = (MetaTilePreview *)user_data;
GdkScreen *screen = gdk_screen_get_default ();
GdkVisual *visual = gdk_screen_get_rgba_visual (screen);
preview->has_alpha = visual && gdk_screen_is_composited (screen);
}
MetaTilePreview *
meta_tile_preview_new (gboolean composited)
{
MetaTilePreview *preview;
GdkVisual *visual;
GdkScreen *screen;
screen = gdk_screen_get_default ();
visual = gdk_screen_get_rgba_visual (screen);
preview = g_new (MetaTilePreview, 1);
preview->preview_window = gtk_window_new (GTK_WINDOW_POPUP);
gtk_window_set_screen (GTK_WINDOW (preview->preview_window), screen);
gtk_widget_set_app_paintable (preview->preview_window, TRUE);
preview->preview_color = NULL;
preview->tile_rect.x = preview->tile_rect.y = 0;
preview->tile_rect.width = preview->tile_rect.height = 0;
preview->has_alpha = visual && composited;
if (preview->has_alpha)
{
gtk_widget_set_visual (preview->preview_window, visual);
g_signal_connect (preview->preview_window, "style-updated",
G_CALLBACK (meta_tile_preview_style_updated), preview);
g_signal_connect (preview->preview_window, "composited-changed",
G_CALLBACK (meta_tile_preview_composited_changed), preview);
meta_tile_preview_style_updated (preview->preview_window, preview);
}
gtk_widget_realize (preview->preview_window);
g_signal_connect (preview->preview_window, "draw",
G_CALLBACK (meta_tile_preview_draw), preview);
return preview;
}
void
meta_tile_preview_free (MetaTilePreview *preview)
{
gtk_widget_destroy (preview->preview_window);
if (preview->preview_color)
gdk_rgba_free (preview->preview_color);
g_free (preview);
}
void
meta_tile_preview_show (MetaTilePreview *preview,
MetaRectangle *tile_rect)
{
GdkWindow *window;
GdkRectangle old_rect;
if (gtk_widget_get_visible (preview->preview_window)
&& preview->tile_rect.x == tile_rect->x
&& preview->tile_rect.y == tile_rect->y
&& preview->tile_rect.width == tile_rect->width
&& preview->tile_rect.height == tile_rect->height)
return; /* nothing to do */
gtk_widget_show (preview->preview_window);
window = gtk_widget_get_window (preview->preview_window);
meta_core_lower_beneath_focus_window (gdk_x11_get_default_xdisplay(),
GDK_WINDOW_XID (window),
gtk_get_current_event_time ());
old_rect.x = old_rect.y = 0;
old_rect.width = preview->tile_rect.width;
old_rect.height = preview->tile_rect.height;
gdk_window_invalidate_rect (window, &old_rect, FALSE);
preview->tile_rect = *tile_rect;
gdk_window_move_resize (window,
preview->tile_rect.x, preview->tile_rect.y,
preview->tile_rect.width, preview->tile_rect.height);
if (!preview->has_alpha)
{
cairo_rectangle_int_t outer_rect, inner_rect;
cairo_region_t *outer_region, *inner_region;
GdkRGBA black = {.0, .0, .0, 1.0};
G_GNUC_BEGIN_IGNORE_DEPRECATIONS
gdk_window_set_background_rgba (window, &black);
G_GNUC_END_IGNORE_DEPRECATIONS
outer_rect.x = outer_rect.y = 0;
outer_rect.width = preview->tile_rect.width;
outer_rect.height = preview->tile_rect.height;
inner_rect.x = OUTLINE_WIDTH;
inner_rect.y = OUTLINE_WIDTH;
inner_rect.width = outer_rect.width - 2 * OUTLINE_WIDTH;
inner_rect.height = outer_rect.height - 2 * OUTLINE_WIDTH;
outer_region = cairo_region_create_rectangle (&outer_rect);
inner_region = cairo_region_create_rectangle (&inner_rect);
cairo_region_subtract (outer_region, inner_region);
cairo_region_destroy (inner_region);
gtk_widget_shape_combine_region (preview->preview_window, outer_region);
cairo_region_destroy (outer_region);
}
else
{
gtk_widget_shape_combine_region (preview->preview_window, NULL);
}
}
void
meta_tile_preview_hide (MetaTilePreview *preview)
{
gtk_widget_hide (preview->preview_window);
}