From e6565598a4a1c371cfc091c00ba905b5e96ecc15 Mon Sep 17 00:00:00 2001
From: Nick Bowler <nbowler@draconx.ca>
Date: Sat, 14 Mar 2009 19:34:18 -0400
Subject: [PATCH] Add height constraining and positioning options.

---
 aspectbin.c | 20 +++++++++++++++-----
 aspectbin.h |  5 ++++-
 main.c      |  5 ++++-
 3 files changed, 23 insertions(+), 7 deletions(-)

diff --git a/aspectbin.c b/aspectbin.c
index 339c8ae..c9fe6a5 100644
--- a/aspectbin.c
+++ b/aspectbin.c
@@ -10,8 +10,10 @@ G_DEFINE_TYPE(AspectBin, aspect_bin, GTK_TYPE_BIN)
 
 static void aspect_bin_init(AspectBin *ab)
 {
-	ab->child = NULL;
-	ab->ratio = 1;
+	ab->child     = NULL;
+	ab->ratio     = 1;
+	ab->constrain = FALSE;
+	ab->align     = 0;
 }
 
 static void aspect_bin_class_init(AspectBinClass *abc)
@@ -94,6 +96,7 @@ aspect_bin_size_allocate(GtkWidget *widget, GtkAllocation *allocation)
 	GtkRequisition creq = {0};
 	GtkAllocation csize = {0}, asize = {0};
 	
+	/* First find the best fit for the constrained child. */
 	if (abin->child && GTK_WIDGET_VISIBLE(abin->child)) {
 		asize.height = allocation->height;
 		asize.width  = asize.height * abin->ratio + 0.5;
@@ -104,20 +107,27 @@ aspect_bin_size_allocate(GtkWidget *widget, GtkAllocation *allocation)
 		}
 	}
 
+	/* Now try to fit the other child. */
 	if (bin->child && GTK_WIDGET_VISIBLE(bin->child)) {
 		gtk_widget_get_child_requisition(bin->child, &creq);
 
 		if (allocation->width - asize.width < creq.width) {
+			/* It didn't fit, squish the constrained guy. */
 			asize.width  = allocation->width - creq.width;
 			asize.height = asize.width / abin->ratio + 0.5;
 		}
 
-		csize.width = allocation->width - asize.width;
-		csize.height = allocation->height;
+		csize.width  = allocation->width - asize.width;
+		csize.height = MIN(allocation->height, creq.height);
+		if (abin->constrain) {
+			csize.height = MAX(csize.height, asize.height);
+		}
 		csize.x = asize.width;
-		csize.y = 0;
 	}
 
+	csize.y = (allocation->height - csize.height) * abin->align + 0.5;
+	asize.y = (allocation->height - asize.height) * abin->align + 0.5;
+
 	if (bin->child)
 		gtk_widget_size_allocate(bin->child, &csize);
 	if (abin->child)
diff --git a/aspectbin.h b/aspectbin.h
index bca5ba7..e4148c6 100644
--- a/aspectbin.h
+++ b/aspectbin.h
@@ -18,7 +18,10 @@ struct AspectBin {
 	GtkBin bin;
 
 	GtkWidget *child;
-	gfloat ratio;
+	gfloat     ratio;
+
+	gfloat     align;
+	gboolean   constrain;
 };
 
 struct AspectBinClass {
diff --git a/main.c b/main.c
index 72b4d97..0485862 100644
--- a/main.c
+++ b/main.c
@@ -17,8 +17,11 @@ int main(int argc, char **argv)
 	button1 = gtk_button_new_with_label("Square");
 	button2 = gtk_button_new_with_label("Rectangle");
 	aspect_bin_set_body_widget(ASPECT_BIN(aspectbin), button1, 1);
-	gtk_container_add(GTK_CONTAINER(aspectbin), button2);
 
+	ASPECT_BIN(aspectbin)->constrain = TRUE;
+	ASPECT_BIN(aspectbin)->align     = 0.5;
+
+	gtk_container_add(GTK_CONTAINER(aspectbin), button2);
 	gtk_container_add(GTK_CONTAINER(window), aspectbin);
 
 	gtk_widget_show_all(window);
-- 
2.43.2