Add GtkMagnifier
This is a private widget that takes another widget on construction, and is able to render parts of it, possibly at a different magnification level.
This commit is contained in:
Carlos Garnacho
parent
15d7d5b31f
commit
61ab302c75
@ -490,6 +490,7 @@ gtk_private_h_sources = \
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gtkkeyhash.h \
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gtklabelprivate.h \
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gtklockbuttonprivate.h \
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gtkmagnifierprivate.h \
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gtkmenubuttonprivate.h \
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gtkmenuprivate.h \
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gtkmenuitemprivate.h \
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@ -763,6 +764,7 @@ gtk_base_c_sources = \
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gtkliststore.c \
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gtklockbutton.c \
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gtkmain.c \
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gtkmagnifier.c \
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gtkmarshalers.c \
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gtkmenu.c \
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gtkmenubar.c \
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269
gtk/gtkmagnifier.c
Normal file
269
gtk/gtkmagnifier.c
Normal file
@ -0,0 +1,269 @@
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/* GTK - The GIMP Toolkit
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* Copyright © 2013 Carlos Garnacho <carlosg@gnome.org>
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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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#include "config.h"
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#include "gtk/gtk.h"
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#include "gtkmagnifierprivate.h"
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#include "gtkintl.h"
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enum {
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PROP_INSPECTED = 1,
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PROP_MAGNIFICATION
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};
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typedef struct _GtkMagnifierPrivate GtkMagnifierPrivate;
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struct _GtkMagnifierPrivate
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{
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GtkWidget *inspected;
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gdouble magnification;
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gint x;
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gint y;
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};
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G_DEFINE_TYPE_WITH_PRIVATE (GtkMagnifier, _gtk_magnifier,
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GTK_TYPE_WIDGET)
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static void
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_gtk_magnifier_set_property (GObject *object,
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guint param_id,
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const GValue *value,
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GParamSpec *pspec)
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{
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switch (param_id)
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{
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case PROP_INSPECTED:
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_gtk_magnifier_set_inspected (GTK_MAGNIFIER (object),
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g_value_get_object (value));
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break;
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case PROP_MAGNIFICATION:
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_gtk_magnifier_set_magnification (GTK_MAGNIFIER (object),
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g_value_get_double (value));
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, param_id, pspec);
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}
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}
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static void
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_gtk_magnifier_get_property (GObject *object,
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guint param_id,
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GValue *value,
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GParamSpec *pspec)
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{
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GtkMagnifier *magnifier;
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GtkMagnifierPrivate *priv;
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magnifier = GTK_MAGNIFIER (object);
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priv = _gtk_magnifier_get_instance_private (magnifier);
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switch (param_id)
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{
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case PROP_INSPECTED:
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g_value_set_object (value, priv->inspected);
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break;
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case PROP_MAGNIFICATION:
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g_value_set_double (value, priv->magnification);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, param_id, pspec);
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}
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}
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static gboolean
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_gtk_magnifier_draw (GtkWidget *widget,
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cairo_t *cr)
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{
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GtkAllocation allocation, inspected_alloc;
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GtkMagnifier *magnifier;
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GtkMagnifierPrivate *priv;
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gdouble x, y;
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magnifier = GTK_MAGNIFIER (widget);
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priv = _gtk_magnifier_get_instance_private (magnifier);
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if (!gtk_widget_is_visible (priv->inspected))
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return FALSE;
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gtk_widget_get_allocation (widget, &allocation);
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gtk_widget_get_allocation (priv->inspected, &inspected_alloc);
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cairo_translate (cr, allocation.width / 2, allocation.height / 2);
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x = CLAMP (priv->x, 0, inspected_alloc.width);
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y = CLAMP (priv->y, 0, inspected_alloc.height);
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cairo_save (cr);
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cairo_scale (cr, priv->magnification, priv->magnification);
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cairo_translate (cr, -x, -y);
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gtk_widget_draw (priv->inspected, cr);
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cairo_restore (cr);
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return TRUE;
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}
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static void
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_gtk_magnifier_class_init (GtkMagnifierClass *klass)
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{
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GObjectClass *object_class = G_OBJECT_CLASS (klass);
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GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (klass);
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object_class->set_property = _gtk_magnifier_set_property;
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object_class->get_property = _gtk_magnifier_get_property;
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widget_class->draw = _gtk_magnifier_draw;
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g_object_class_install_property (object_class,
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PROP_INSPECTED,
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g_param_spec_object (P_("inspected"),
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P_("Inspected"),
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P_("Inspected widget"),
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GTK_TYPE_WIDGET,
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G_PARAM_READWRITE));
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g_object_class_install_property (object_class,
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PROP_MAGNIFICATION,
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g_param_spec_double (P_("magnification"),
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P_("magnification"),
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P_("magnification"),
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1, G_MAXDOUBLE, 1,
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G_PARAM_READWRITE));
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}
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static void
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_gtk_magnifier_init (GtkMagnifier *magnifier)
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{
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GtkWidget *widget = GTK_WIDGET (magnifier);
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GtkMagnifierPrivate *priv;
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priv = _gtk_magnifier_get_instance_private (magnifier);
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gtk_widget_set_events (widget,
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gtk_widget_get_events (widget) |
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GDK_EXPOSURE_MASK);
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gtk_widget_set_has_window (widget, FALSE);
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priv->magnification = 1;
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}
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GtkWidget *
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_gtk_magnifier_new (GtkWidget *inspected)
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{
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g_return_val_if_fail (GTK_IS_WIDGET (inspected), NULL);
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return g_object_new (GTK_TYPE_MAGNIFIER,
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"inspected", inspected,
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NULL);
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}
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GtkWidget *
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_gtk_magnifier_get_inspected (GtkMagnifier *magnifier)
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{
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GtkMagnifierPrivate *priv;
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g_return_val_if_fail (GTK_IS_MAGNIFIER (magnifier), NULL);
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priv = _gtk_magnifier_get_instance_private (magnifier);
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return priv->inspected;
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}
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void
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_gtk_magnifier_set_inspected (GtkMagnifier *magnifier,
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GtkWidget *inspected)
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{
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GtkMagnifierPrivate *priv;
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g_return_val_if_fail (GTK_IS_MAGNIFIER (magnifier), NULL);
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priv = _gtk_magnifier_get_instance_private (magnifier);
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if (priv->inspected == inspected)
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return;
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priv->inspected = inspected;
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g_object_notify (G_OBJECT (magnifier), "inspected");
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}
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void
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_gtk_magnifier_set_coords (GtkMagnifier *magnifier,
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gdouble x,
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gdouble y)
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{
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GtkMagnifierPrivate *priv;
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g_return_if_fail (GTK_IS_MAGNIFIER (magnifier));
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priv = _gtk_magnifier_get_instance_private (magnifier);
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if (priv->x == x && priv->y == y)
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return;
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priv->x = x;
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priv->y = y;
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if (gtk_widget_is_visible (GTK_WIDGET (magnifier)))
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gtk_widget_queue_draw (GTK_WIDGET (magnifier));
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}
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void
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_gtk_magnifier_get_coords (GtkMagnifier *magnifier,
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gdouble *x,
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gdouble *y)
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{
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GtkMagnifierPrivate *priv;
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g_return_if_fail (GTK_IS_MAGNIFIER (magnifier));
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priv = _gtk_magnifier_get_instance_private (magnifier);
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if (x)
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*x = priv->x;
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if (y)
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*y = priv->y;
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}
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void
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_gtk_magnifier_set_magnification (GtkMagnifier *magnifier,
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gdouble magnification)
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{
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GtkMagnifierPrivate *priv;
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g_return_if_fail (GTK_IS_MAGNIFIER (magnifier));
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priv = _gtk_magnifier_get_instance_private (magnifier);
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if (priv->magnification == magnification)
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return;
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priv->magnification = magnification;
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g_object_notify (G_OBJECT (magnifier), "magnification");
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if (gtk_widget_is_visible (GTK_WIDGET (magnifier)))
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gtk_widget_queue_draw (GTK_WIDGET (magnifier));
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}
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gdouble
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_gtk_magnifier_get_magnification (GtkMagnifier *magnifier)
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{
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GtkMagnifierPrivate *priv;
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g_return_val_if_fail (GTK_IS_MAGNIFIER (magnifier), 1);
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priv = _gtk_magnifier_get_instance_private (magnifier);
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return priv->magnification;
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}
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64
gtk/gtkmagnifierprivate.h
Normal file
64
gtk/gtkmagnifierprivate.h
Normal file
@ -0,0 +1,64 @@
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/* GTK - The GIMP Toolkit
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* Copyright © 2013 Carlos Garnacho <carlosg@gnome.org>
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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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#ifndef __GTK_MAGNIFIER_H__
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#define __GTK_MAGNIFIER_H__
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G_BEGIN_DECLS
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#define GTK_TYPE_MAGNIFIER (_gtk_magnifier_get_type ())
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#define GTK_MAGNIFIER(o) (G_TYPE_CHECK_INSTANCE_CAST ((o), GTK_TYPE_MAGNIFIER, GtkMagnifier))
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#define GTK_MAGNIFIER_CLASS(c) (G_TYPE_CHECK_CLASS_CAST ((c), GTK_TYPE_MAGNIFIER, GtkMagnifierClass))
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#define GTK_IS_MAGNIFIER(o) (G_TYPE_CHECK_INSTANCE_TYPE ((o), GTK_TYPE_MAGNIFIER))
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#define GTK_IS_MAGNIFIER_CLASS(o) (G_TYPE_CHECK_CLASS_TYPE ((o), GTK_TYPE_MAGNIFIER))
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#define GTK_MAGNIFIER_GET_CLASS(o) (G_TYPE_INSTANCE_GET_CLASS ((o), GTK_TYPE_MAGNIFIER, GtkMagnifierClass))
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typedef struct _GtkMagnifier GtkMagnifier;
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typedef struct _GtkMagnifierClass GtkMagnifierClass;
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struct _GtkMagnifier
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{
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GtkWidget parent_instance;
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};
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struct _GtkMagnifierClass
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{
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GtkWidgetClass parent_class;
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};
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GType _gtk_magnifier_get_type (void) G_GNUC_CONST;
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GtkWidget * _gtk_magnifier_new (GtkWidget *inspected);
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GtkWidget * _gtk_magnifier_get_inspected (GtkMagnifier *magnifier);
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void _gtk_magnifier_set_inspected (GtkMagnifier *magnifier,
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GtkWidget *inspected);
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void _gtk_magnifier_set_coords (GtkMagnifier *magnifier,
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gdouble x,
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gdouble y);
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void _gtk_magnifier_get_coords (GtkMagnifier *magnifier,
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gdouble *x,
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gdouble *y);
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void _gtk_magnifier_set_magnification (GtkMagnifier *magnifier,
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gdouble magnification);
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gdouble _gtk_magnifier_get_magnification (GtkMagnifier *magnifier);
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G_END_DECLS
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#endif /* __GTK_MAGNIFIER_H__ */
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