gtk2/gtk/gtkaspectframe.c

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1997-11-24 22:37:52 +00:00
/* GTK - The GIMP Toolkit
* Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
*
* GtkAspectFrame: Ensure that the child window has a specified aspect ratio
* or, if obey_child, has the same aspect ratio as its requested size
*
* Copyright Owen Taylor 4/9/97
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the Free
* Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "gtkaspectframe.h"
static void gtk_aspect_frame_class_init (GtkAspectFrameClass *klass);
static void gtk_aspect_frame_init (GtkAspectFrame *aspect_frame);
static void gtk_aspect_frame_draw (GtkWidget *widget,
GdkRectangle *area);
static void gtk_aspect_frame_paint (GtkWidget *widget,
GdkRectangle *area);
static gint gtk_aspect_frame_expose (GtkWidget *widget,
GdkEventExpose *event);
static void gtk_aspect_frame_size_allocate (GtkWidget *widget,
GtkAllocation *allocation);
#define MAX_RATIO 10000.0
#define MIN_RATIO 0.0001
guint
gtk_aspect_frame_get_type ()
{
static guint aspect_frame_type = 0;
if (!aspect_frame_type)
{
GtkTypeInfo aspect_frame_info =
{
"GtkAspectFrame",
sizeof (GtkAspectFrame),
sizeof (GtkAspectFrameClass),
(GtkClassInitFunc) gtk_aspect_frame_class_init,
(GtkObjectInitFunc) gtk_aspect_frame_init,
(GtkArgSetFunc) NULL,
(GtkArgGetFunc) NULL,
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};
aspect_frame_type = gtk_type_unique (gtk_frame_get_type (), &aspect_frame_info);
}
return aspect_frame_type;
}
static void
gtk_aspect_frame_class_init (GtkAspectFrameClass *class)
{
GtkWidgetClass *widget_class;
widget_class = (GtkWidgetClass*) class;
widget_class->draw = gtk_aspect_frame_draw;
widget_class->expose_event = gtk_aspect_frame_expose;
widget_class->size_allocate = gtk_aspect_frame_size_allocate;
}
static void
gtk_aspect_frame_init (GtkAspectFrame *aspect_frame)
{
aspect_frame->xalign = 0.5;
aspect_frame->yalign = 0.5;
aspect_frame->ratio = 1.0;
aspect_frame->obey_child = 1;
aspect_frame->center_allocation.x = -1;
aspect_frame->center_allocation.y = -1;
aspect_frame->center_allocation.width = 1;
aspect_frame->center_allocation.height = 1;
}
GtkWidget*
gtk_aspect_frame_new (const gchar *label,
gfloat xalign,
gfloat yalign,
gfloat ratio,
gint obey_child)
{
GtkAspectFrame *aspect_frame;
aspect_frame = gtk_type_new (gtk_aspect_frame_get_type ());
aspect_frame->xalign = CLAMP (xalign, 0.0, 1.0);
aspect_frame->yalign = CLAMP (yalign, 0.0, 1.0);
aspect_frame->ratio = CLAMP (ratio, MIN_RATIO, MAX_RATIO);
aspect_frame->obey_child = obey_child;
gtk_frame_set_label (GTK_FRAME(aspect_frame), label);
return GTK_WIDGET (aspect_frame);
}
void
gtk_aspect_frame_set (GtkAspectFrame *aspect_frame,
gfloat xalign,
gfloat yalign,
gfloat ratio,
gint obey_child)
{
g_return_if_fail (aspect_frame != NULL);
g_return_if_fail (GTK_IS_ASPECT_FRAME (aspect_frame));
xalign = CLAMP (xalign, 0.0, 1.0);
yalign = CLAMP (yalign, 0.0, 1.0);
ratio = CLAMP (ratio, MIN_RATIO, MAX_RATIO);
if ((aspect_frame->xalign != xalign) ||
(aspect_frame->yalign != yalign) ||
(aspect_frame->ratio != ratio) ||
(aspect_frame->obey_child != obey_child))
{
GtkWidget *widget = GTK_WIDGET(aspect_frame);
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aspect_frame->xalign = xalign;
aspect_frame->yalign = yalign;
aspect_frame->ratio = ratio;
aspect_frame->obey_child = obey_child;
if (GTK_WIDGET_DRAWABLE(widget))
gdk_window_clear_area (widget->window,
widget->allocation.x,
widget->allocation.y,
widget->allocation.width,
widget->allocation.height);
gtk_widget_queue_resize (widget);
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}
}
static void
gtk_aspect_frame_paint (GtkWidget *widget,
GdkRectangle *area)
{
GtkFrame *frame;
gint height_extra;
gint label_area_width;
gint x, y;
GtkAllocation *allocation;
g_return_if_fail (widget != NULL);
g_return_if_fail (GTK_IS_ASPECT_FRAME (widget));
g_return_if_fail (area != NULL);
if (GTK_WIDGET_DRAWABLE (widget))
{
frame = GTK_FRAME (widget);
allocation = &GTK_ASPECT_FRAME(widget)->center_allocation;
height_extra = frame->label_height - widget->style->klass->xthickness;
height_extra = MAX (height_extra, 0);
x = GTK_CONTAINER (frame)->border_width;
y = GTK_CONTAINER (frame)->border_width;
gtk_draw_shadow (widget->style, widget->window,
GTK_STATE_NORMAL, frame->shadow_type,
allocation->x + x,
allocation->y + y + height_extra / 2,
allocation->width - x * 2,
allocation->height - y * 2 - height_extra / 2);
if (frame->label)
{
label_area_width = (allocation->width +
GTK_CONTAINER (frame)->border_width * 2 -
widget->style->klass->xthickness * 2);
x = ((label_area_width - frame->label_width) * frame->label_xalign +
GTK_CONTAINER (frame)->border_width + widget->style->klass->xthickness);
y = (GTK_CONTAINER (frame)->border_width + widget->style->font->ascent);
gdk_window_clear_area (widget->window,
allocation->x + x + 2,
allocation->y + GTK_CONTAINER (frame)->border_width,
frame->label_width - 4, frame->label_height);
gtk_draw_string (widget->style, widget->window, GTK_WIDGET_STATE (widget),
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allocation->x + x + 3,
allocation->y + y,
frame->label);
}
}
}
/* the only modification to the next two routines is to call
gtk_aspect_frame_paint instead of gtk_frame_paint */
static void
gtk_aspect_frame_draw (GtkWidget *widget,
GdkRectangle *area)
{
GtkBin *bin;
GdkRectangle child_area;
g_return_if_fail (widget != NULL);
g_return_if_fail (GTK_IS_ASPECT_FRAME (widget));
g_return_if_fail (area != NULL);
if (GTK_WIDGET_DRAWABLE (widget))
{
bin = GTK_BIN (widget);
gtk_aspect_frame_paint (widget, area);
if (bin->child && gtk_widget_intersect (bin->child, area, &child_area))
gtk_widget_draw (bin->child, &child_area);
}
}
static gint
gtk_aspect_frame_expose (GtkWidget *widget,
GdkEventExpose *event)
{
GtkBin *bin;
GdkEventExpose child_event;
g_return_val_if_fail (widget != NULL, FALSE);
g_return_val_if_fail (GTK_IS_ASPECT_FRAME (widget), FALSE);
g_return_val_if_fail (event != NULL, FALSE);
if (GTK_WIDGET_DRAWABLE (widget))
{
bin = GTK_BIN (widget);
gtk_aspect_frame_paint (widget, &event->area);
child_event = *event;
if (bin->child &&
GTK_WIDGET_NO_WINDOW (bin->child) &&
gtk_widget_intersect (bin->child, &event->area, &child_event.area))
gtk_widget_event (bin->child, (GdkEvent*) &child_event);
}
return FALSE;
}
static void
gtk_aspect_frame_size_allocate (GtkWidget *widget,
GtkAllocation *allocation)
{
GtkFrame *frame;
GtkAspectFrame *aspect_frame;
GtkBin *bin;
GtkAllocation child_allocation;
gint x,y;
gint width,height;
gdouble ratio;
g_return_if_fail (widget != NULL);
g_return_if_fail (GTK_IS_ASPECT_FRAME (widget));
g_return_if_fail (allocation != NULL);
aspect_frame = GTK_ASPECT_FRAME (widget);
frame = GTK_FRAME (widget);
bin = GTK_BIN (widget);
if (GTK_WIDGET_DRAWABLE (widget) &&
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((widget->allocation.x != allocation->x) ||
(widget->allocation.y != allocation->y) ||
(widget->allocation.width != allocation->width) ||
(widget->allocation.height != allocation->height)) &&
(widget->allocation.width != 0) &&
(widget->allocation.height != 0))
gdk_window_clear_area (widget->window,
widget->allocation.x,
widget->allocation.y,
widget->allocation.width,
widget->allocation.height);
widget->allocation = *allocation;
if (bin->child && GTK_WIDGET_VISIBLE (bin->child))
{
if (aspect_frame->obey_child)
{
if (bin->child->requisition.height != 0)
{
ratio = (gdouble)bin->child->requisition.width /
bin->child->requisition.height;
if (ratio < MIN_RATIO) ratio = MIN_RATIO;
}
else
if (bin->child->requisition.height != 0)
ratio = MAX_RATIO;
else
ratio = 1.0;
}
else
ratio = aspect_frame->ratio;
x = (GTK_CONTAINER (frame)->border_width +
GTK_WIDGET (frame)->style->klass->xthickness);
width = allocation->width - x * 2;
y = (GTK_CONTAINER (frame)->border_width +
MAX (frame->label_height, GTK_WIDGET (frame)->style->klass->ythickness));
height = (allocation->height - y -
GTK_CONTAINER (frame)->border_width -
GTK_WIDGET (frame)->style->klass->ythickness);
/* make sure we don't allocate a negative width or height,
* since that will be cast to a (very big) guint16 */
width = MAX (0, width);
height = MAX (0, height);
if (ratio * height > width)
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{
child_allocation.width = width;
child_allocation.height = width/ratio + 0.5;
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}
else
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{
child_allocation.width = ratio*height + 0.5;
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child_allocation.height = height;
}
child_allocation.x = aspect_frame->xalign * (width - child_allocation.width) + allocation->x + x;
child_allocation.y = aspect_frame->yalign * (height - child_allocation.height) + allocation->y + y;
aspect_frame->center_allocation.width = child_allocation.width + 2*x;
aspect_frame->center_allocation.x = child_allocation.x - x;
aspect_frame->center_allocation.height = child_allocation.height + y +
GTK_CONTAINER (frame)->border_width +
GTK_WIDGET (frame)->style->klass->ythickness;
aspect_frame->center_allocation.y = child_allocation.y - y;
gtk_widget_size_allocate (bin->child, &child_allocation);
}
}