forked from AuroraMiddleware/gtk
6055028c96
Instead of having gtk_snapshot_append_foo_node(), just have gtk_snapshot_append_foo(). Nobody needs to know that this internally uses nodes.
471 lines
15 KiB
C
471 lines
15 KiB
C
/* GTK - The GIMP Toolkit
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* Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
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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 Lesser 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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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser 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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/*
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* Modified by the GTK+ Team and others 1997-2000. See the AUTHORS
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* file for a list of people on the GTK+ Team. See the ChangeLog
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* files for a list of changes. These files are distributed with
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* GTK+ at ftp://ftp.gtk.org/pub/gtk/.
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*/
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#include "config.h"
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#include "gtkdrawingarea.h"
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#include "gtkintl.h"
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#include "gtkprivate.h"
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#include "gtksnapshot.h"
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#include "gtkstylecontext.h"
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typedef struct _GtkDrawingAreaPrivate GtkDrawingAreaPrivate;
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struct _GtkDrawingAreaPrivate {
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int content_width;
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int content_height;
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GtkDrawingAreaDrawFunc draw_func;
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gpointer draw_func_target;
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GDestroyNotify draw_func_target_destroy_notify;
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};
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enum {
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PROP_0,
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PROP_CONTENT_WIDTH,
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PROP_CONTENT_HEIGHT,
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LAST_PROP
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};
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static GParamSpec *props[LAST_PROP] = { NULL, };
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/**
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* SECTION:gtkdrawingarea
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* @Short_description: A simple widget for custom user interface elements
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* @Title: GtkDrawingArea
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* @See_also: #GtkImage
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*
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* The #GtkDrawingArea widget is used for creating custom user interface
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* elements. It’s essentially a blank widget; you can draw on it. After
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* creating a drawing area, the application may want to connect to:
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*
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* - Mouse and button press signals to respond to input from
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* the user. (Use gtk_widget_add_events() to enable events
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* you wish to receive.)
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*
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* - The #GtkWidget::realize signal to take any necessary actions
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* when the widget is instantiated on a particular display.
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* (Create GDK resources in response to this signal.)
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*
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* - The #GtkWidget::size-allocate signal to take any necessary
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* actions when the widget changes size.
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*
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* - Call gtk_drawing_area_set_draw_func() to handle redrawing the
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* contents of the widget.
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*
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* The following code portion demonstrates using a drawing
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* area to display a circle in the normal widget foreground
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* color.
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*
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* Note that GDK automatically clears the exposed area before causing a
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* redraw, and that drawing is implicitly clipped to the exposed
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* area. If you want to have a theme-provided background, you need
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* to call gtk_render_background() in your ::draw method.
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*
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* ## Simple GtkDrawingArea usage
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*
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* |[<!-- language="C" -->
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* void
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* draw_function (GtkDrawingArea *area, cairo_t *cr,
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* int width, int height,
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* gpointer data)
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* {
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* GdkRGBA color;
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* GtkStyleContext *context;
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*
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* context = gtk_widget_get_style_context (GTK_WIDGET (area));
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*
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* gtk_render_background (context, cr, 0, 0, width, height);
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*
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* cairo_arc (cr,
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* width / 2.0, height / 2.0,
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* MIN (width, height) / 2.0,
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* 0, 2 * G_PI);
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*
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* gtk_style_context_get_color (context,
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* gtk_style_context_get_state (context),
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* &color);
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* gdk_cairo_set_source_rgba (cr, &color);
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*
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* cairo_fill (cr);
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* }
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* [...]
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* GtkWidget *area = gtk_drawing_area_new ();
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* gtk_drawing_area_set_content_width (GTK_DRAWING_AREA (area), 100);
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* gtk_drawing_area_set_content_height (GTK_DRAWING_AREA (area), 100);
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* gtk_drawing_area_set_draw_func (GTK_DRAWING_AREA (area),
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* draw_function,
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* NULL, NULL);
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* ]|
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*
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* The draw function is normally called when a drawing area first comes
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* onscreen, or when it’s covered by another window and then uncovered.
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* You can also force a redraw by adding to the “damage region” of the
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* drawing area’s window using gtk_widget_queue_draw_region(),
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* gtk_widget_queue_draw_area() or gtk_widget_queue_draw().
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* This will cause the drawing area to call the draw function again.
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*
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* The available routines for drawing are documented on the
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* [GDK Drawing Primitives][gdk3-Cairo-Interaction] page
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* and the cairo documentation.
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*
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* To receive mouse events on a drawing area, you will need to enable
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* them with gtk_widget_add_events(). To receive keyboard events, you
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* will need to set the “can-focus” property on the drawing area, and you
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* should probably draw some user-visible indication that the drawing
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* area is focused. Use gtk_widget_has_focus() in your expose event
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* handler to decide whether to draw the focus indicator. See
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* gtk_render_focus() for one way to draw focus.
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*
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* If you need more complex control over your widget, you should consider
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* creating your own #GtkWidget subclass.
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*/
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G_DEFINE_TYPE_WITH_PRIVATE (GtkDrawingArea, gtk_drawing_area, GTK_TYPE_WIDGET)
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static void
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gtk_drawing_area_set_property (GObject *gobject,
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guint prop_id,
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const GValue *value,
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GParamSpec *pspec)
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{
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GtkDrawingArea *self = GTK_DRAWING_AREA (gobject);
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switch (prop_id)
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{
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case PROP_CONTENT_WIDTH:
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gtk_drawing_area_set_content_width (self, g_value_get_int (value));
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break;
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case PROP_CONTENT_HEIGHT:
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gtk_drawing_area_set_content_height (self, g_value_get_int (value));
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (gobject, prop_id, pspec);
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}
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}
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static void
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gtk_drawing_area_get_property (GObject *gobject,
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guint prop_id,
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GValue *value,
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GParamSpec *pspec)
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{
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GtkDrawingArea *self = GTK_DRAWING_AREA (gobject);
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GtkDrawingAreaPrivate *priv = gtk_drawing_area_get_instance_private (self);
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switch (prop_id)
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{
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case PROP_CONTENT_WIDTH:
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g_value_set_int (value, priv->content_width);
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break;
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case PROP_CONTENT_HEIGHT:
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g_value_set_int (value, priv->content_height);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (gobject, prop_id, pspec);
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}
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}
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static void
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gtk_drawing_area_dispose (GObject *object)
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{
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GtkDrawingArea *self = GTK_DRAWING_AREA (object);
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GtkDrawingAreaPrivate *priv = gtk_drawing_area_get_instance_private (self);
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if (priv->draw_func_target_destroy_notify != NULL)
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priv->draw_func_target_destroy_notify (priv->draw_func_target);
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priv->draw_func = NULL;
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priv->draw_func_target = NULL;
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priv->draw_func_target_destroy_notify = NULL;
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G_OBJECT_CLASS (gtk_drawing_area_parent_class)->dispose (object);
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}
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static void
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gtk_drawing_area_measure (GtkWidget *widget,
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GtkOrientation orientation,
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int for_size,
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int *minimum,
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int *natural,
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int *minimum_baseline,
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int *natural_baseline)
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{
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GtkDrawingArea *self = GTK_DRAWING_AREA (widget);
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GtkDrawingAreaPrivate *priv = gtk_drawing_area_get_instance_private (self);
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if (orientation == GTK_ORIENTATION_HORIZONTAL)
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{
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*minimum = *natural = priv->content_width;
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}
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else
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{
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*minimum = *natural = priv->content_height;
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}
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}
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static void
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gtk_drawing_area_snapshot (GtkWidget *widget,
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GtkSnapshot *snapshot)
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{
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GtkDrawingArea *self = GTK_DRAWING_AREA (widget);
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GtkDrawingAreaPrivate *priv = gtk_drawing_area_get_instance_private (self);
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cairo_t *cr;
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if (!priv->draw_func)
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return;
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cr = gtk_snapshot_append_cairo (snapshot,
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&GRAPHENE_RECT_INIT (
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0, 0,
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gtk_widget_get_allocated_width (widget),
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gtk_widget_get_allocated_height (widget)
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),
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"DrawingAreaContents");
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priv->draw_func (self,
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cr,
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gtk_widget_get_allocated_width (widget),
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gtk_widget_get_allocated_height (widget),
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priv->draw_func_target);
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cairo_destroy (cr);
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}
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static void
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gtk_drawing_area_class_init (GtkDrawingAreaClass *class)
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{
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GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (class);
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GObjectClass *gobject_class = G_OBJECT_CLASS (class);
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gobject_class->set_property = gtk_drawing_area_set_property;
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gobject_class->get_property = gtk_drawing_area_get_property;
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gobject_class->dispose = gtk_drawing_area_dispose;
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widget_class->measure = gtk_drawing_area_measure;
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widget_class->snapshot = gtk_drawing_area_snapshot;
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/**
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* GtkDrawingArea:content-width
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*
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* The content width. See gtk_drawing_area_set_content_width() for details.
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*
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* Since: 3.90
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*/
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props[PROP_CONTENT_WIDTH] =
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g_param_spec_int ("content-width",
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P_("Content Width"),
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P_("Desired width for displayed content"),
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0, G_MAXINT, 0,
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GTK_PARAM_READWRITE|G_PARAM_EXPLICIT_NOTIFY);
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/**
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* GtkDrawingArea:content-height
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*
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* The content height. See gtk_drawing_area_set_content_height() for details.
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*
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* Since: 3.90
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*/
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props[PROP_CONTENT_HEIGHT] =
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g_param_spec_int ("content-height",
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P_("Content Height"),
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P_("Desired height for displayed content"),
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0, G_MAXINT, 0,
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GTK_PARAM_READWRITE|G_PARAM_EXPLICIT_NOTIFY);
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g_object_class_install_properties (gobject_class, LAST_PROP, props);
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gtk_widget_class_set_accessible_role (widget_class, ATK_ROLE_DRAWING_AREA);
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}
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static void
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gtk_drawing_area_init (GtkDrawingArea *darea)
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{
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gtk_widget_set_has_window (GTK_WIDGET (darea), FALSE);
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}
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/**
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* gtk_drawing_area_new:
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*
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* Creates a new drawing area.
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*
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* Returns: a new #GtkDrawingArea
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*/
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GtkWidget*
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gtk_drawing_area_new (void)
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{
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return g_object_new (GTK_TYPE_DRAWING_AREA, NULL);
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}
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/**
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* gtk_drawing_area_set_content_width:
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* @self: a #GtkDrawingArea
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* @width: the width of contents
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*
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* Sets the desired width of the contents of the drawing area. Note that
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* because widgets may be allocated larger sizes than they requested, it is
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* possible that the actual width passed to your draw function is larger
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* than the width set here. You can use gtk_widget_set_halign() to avoid
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* that.
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*
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* If the width is set to 0 (the default), the drawing area may disappear.
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*
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* Since: 3.90
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**/
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void
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gtk_drawing_area_set_content_width (GtkDrawingArea *self,
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int width)
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{
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GtkDrawingAreaPrivate *priv = gtk_drawing_area_get_instance_private (self);
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g_return_if_fail (GTK_IS_DRAWING_AREA (self));
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g_return_if_fail (width >= 0);
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if (priv->content_width == width)
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return;
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priv->content_width = width;
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gtk_widget_queue_resize (GTK_WIDGET (self));
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g_object_notify_by_pspec (G_OBJECT (self), props[PROP_CONTENT_WIDTH]);
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}
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/**
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* gtk_drawing_area_get_content_width:
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* @self: a #GtkDrawingArea
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*
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* Retrieves the value previously set via gtk_drawing_area_set_content_width().
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*
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* Returns: The width requested for content of the drawing area
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*
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* Since: 3.90
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**/
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int
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gtk_drawing_area_get_content_width (GtkDrawingArea *self)
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{
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GtkDrawingAreaPrivate *priv = gtk_drawing_area_get_instance_private (self);
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g_return_val_if_fail (GTK_IS_DRAWING_AREA (self), 0);
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return priv->content_width;
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}
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/**
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* gtk_drawing_area_set_content_height:
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* @self: a #GtkDrawingArea
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* @height: the height of contents
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*
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* Sets the desired height of the contents of the drawing area. Note that
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* because widgets may be allocated larger sizes than they requested, it is
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* possible that the actual height passed to your draw function is larger
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* than the height set here. You can use gtk_widget_set_valign() to avoid
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* that.
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*
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* If the height is set to 0 (the default), the drawing area may disappear.
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*
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* Since: 3.90
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**/
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void
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gtk_drawing_area_set_content_height (GtkDrawingArea *self,
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int height)
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{
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GtkDrawingAreaPrivate *priv = gtk_drawing_area_get_instance_private (self);
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g_return_if_fail (GTK_IS_DRAWING_AREA (self));
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g_return_if_fail (height >= 0);
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if (priv->content_height == height)
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return;
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priv->content_height = height;
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gtk_widget_queue_resize (GTK_WIDGET (self));
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g_object_notify_by_pspec (G_OBJECT (self), props[PROP_CONTENT_HEIGHT]);
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}
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/**
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* gtk_drawing_area_get_content_height:
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* @self: a #GtkDrawingArea
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*
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* Retrieves the value previously set via gtk_drawing_area_set_content_height().
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*
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* Returns: The height requested for content of the drawing area
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*
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* Since: 3.90
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**/
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int
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gtk_drawing_area_get_content_height (GtkDrawingArea *self)
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{
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GtkDrawingAreaPrivate *priv = gtk_drawing_area_get_instance_private (self);
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g_return_val_if_fail (GTK_IS_DRAWING_AREA (self), 0);
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return priv->content_height;
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}
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/**
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* gtk_drawing_area_set_draw_func:
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* @self: a #GtkDrawingArea
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* @draw_func: (closure user_data) (allow-none): callback that lets you draw
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* the drawing area's contents
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* @user_data: user data passed to @draw_func
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* @destroy: destroy notifier for @user_data
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*
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* Setting a draw function is the main thing you want to do when using a drawing
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* area. It is called whenever GTK needs to draw the contents of the drawing area
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* to the screen.
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*
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* The draw function will be called during the drawing stage of GTK. In the
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* drawing stage it is not allowed to change properties of any GTK widgets or call
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* any functions that would cause any properties to be changed.
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* You should restrict yourself exclusively to drawing your contents in the draw
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* function.
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*
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* If what you are drawing does change, call gtk_widget_queue_draw() on the
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* drawing area. This will call a redraw and will call @draw_func again.
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*
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* Since: 3.90
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*/
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void
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gtk_drawing_area_set_draw_func (GtkDrawingArea *self,
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GtkDrawingAreaDrawFunc draw_func,
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gpointer user_data,
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GDestroyNotify destroy)
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{
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GtkDrawingAreaPrivate *priv = gtk_drawing_area_get_instance_private (self);
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g_return_if_fail (GTK_IS_DRAWING_AREA (self));
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if (priv->draw_func_target_destroy_notify != NULL)
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priv->draw_func_target_destroy_notify (priv->draw_func_target);
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priv->draw_func = draw_func;
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priv->draw_func_target = user_data;
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priv->draw_func_target_destroy_notify = destroy;
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gtk_widget_queue_draw (GTK_WIDGET (self));
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}
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