Initial revision

1 files changed, 336 insertions, 0 deletions

diff --git a/gtk/gtkaspectframe.c b/gtk/gtkaspectframe.c
new file mode 100644
index 0000000000..2e4795bcae
--- /dev/null
+++ b/gtk/gtkaspectframe.c
@@ -0,0 +1,336 @@
+/* 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,
+	(GtkArgFunc) NULL,
+      };
+
+      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))
+    {
+      aspect_frame->xalign = xalign;
+      aspect_frame->yalign = yalign;
+      aspect_frame->ratio = ratio;
+      aspect_frame->obey_child = obey_child;
+
+      gtk_widget_size_allocate (GTK_WIDGET (aspect_frame), &(GTK_WIDGET (aspect_frame)->allocation));
+      gtk_widget_queue_draw (GTK_WIDGET (aspect_frame));
+    }
+}
+
+static void
+gtk_aspect_frame_paint (GtkWidget    *widget,
+			GdkRectangle *area)
+{
+  GtkFrame *frame;
+  GtkStateType state;
+  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;
+
+      state = widget->state;
+      if (!GTK_WIDGET_IS_SENSITIVE (widget))
+        state = GTK_STATE_INSENSITIVE;
+
+      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, state,
+			   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_MAPPED (widget) &&
+      ((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);
+
+      if (ratio * height > width)
+	{
+	  child_allocation.width = width;
+	  child_allocation.height = width/ratio;
+	}
+      else
+	{
+	  child_allocation.width = ratio*height;
+	  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);
+    }
+}