Todo item:

Closed regions didn't always draw the (+) icon right place, confusing
for users.

Next to that, I think this icon is using a bad metaphor or visual language,
Illustrated best if you close a header in outliner or buttons. Icons are
UI widgets, for screen/editor layouts different controls can be stylized.

My preference is something that aligns visually to the seperators between
regions; for testing and hacking pleasure I've added two quick versions,
a small tabbish thing and a triangle. Enable these with debug menu,
ALT+CTRL+D, values 1 or 2.

This is simply drawn with opengl now. An image for it can be made as well.

Previews:
http://www.blender.org/bf/closed_regions1.png
http://www.blender.org/bf/closed_regions2.png
http://www.blender.org/bf/closed_regions3.png

There's other design ideas to explore as well, like making region deviders
8-10 pixels wide, with a 'drag me' dot on it or so. That takes some screen
estate though, and will require to add big editor-dividers too...
Fun stuff for the mockup-mafia to check on, we have time :)

2 files changed, 7 insertions, 5 deletions

diff --git a/source/blender/editors/interface/interface_draw.c b/source/blender/editors/interface/interface_draw.c
index c7f11116834..97299a6a766 100644
--- a/source/blender/editors/interface/interface_draw.c
+++ b/source/blender/editors/interface/interface_draw.c
@@ -142,13 +142,13 @@ void uiDrawBox(int mode, float minx, float miny, float maxx, float maxy, float r
 
 static void round_box_shade_col(float *col1, float *col2, float fac)
 {
-	float col[3];
+	float col[4];
 
 	col[0]= (fac*col1[0] + (1.0f-fac)*col2[0]);
 	col[1]= (fac*col1[1] + (1.0f-fac)*col2[1]);
 	col[2]= (fac*col1[2] + (1.0f-fac)*col2[2]);
-	
-	glColor3fv(col);
+	col[3]= (fac*col1[3] + (1.0f-fac)*col2[3]);
+	glColor4fv(col);
 }
 
 
@@ -159,7 +159,7 @@ void uiDrawBoxShade(int mode, float minx, float miny, float maxx, float maxy, fl
 	float vec[7][2]= {{0.195, 0.02}, {0.383, 0.067}, {0.55, 0.169}, {0.707, 0.293},
 					  {0.831, 0.45}, {0.924, 0.617}, {0.98, 0.805}};
 	float div= maxy-miny;
-	float coltop[3], coldown[3], color[4];
+	float coltop[4], coldown[4], color[4];
 	int a;
 	
 	/* mult */
@@ -173,9 +173,11 @@ void uiDrawBoxShade(int mode, float minx, float miny, float maxx, float maxy, fl
 	coltop[0]= color[0]+shadetop; if(coltop[0]>1.0f) coltop[0]= 1.0f;
 	coltop[1]= color[1]+shadetop; if(coltop[1]>1.0f) coltop[1]= 1.0f;
 	coltop[2]= color[2]+shadetop; if(coltop[2]>1.0f) coltop[2]= 1.0f;
+	coltop[3]= color[3];
 	coldown[0]= color[0]+shadedown; if(coldown[0]<0.0f) coldown[0]= 0.0f;
 	coldown[1]= color[1]+shadedown; if(coldown[1]<0.0f) coldown[1]= 0.0f;
 	coldown[2]= color[2]+shadedown; if(coldown[2]<0.0f) coldown[2]= 0.0f;
+	coldown[3]= color[3];
 
 	glShadeModel(GL_SMOOTH);
 	glBegin(mode);
diff --git a/source/blender/editors/interface/interface_widgets.c b/source/blender/editors/interface/interface_widgets.c
index b6e255b6758..25a64994f5c 100644
--- a/source/blender/editors/interface/interface_widgets.c
+++ b/source/blender/editors/interface/interface_widgets.c
@@ -180,7 +180,7 @@ void ui_draw_anti_tria(float x1, float y1, float x2, float y2, float x3, float y
 	
 	glEnable(GL_BLEND);
 	glGetFloatv(GL_CURRENT_COLOR, color);
-	color[3]= 0.125;
+	color[3]*= 0.125;
 	glColor4fv(color);
 	
 	/* for each AA step */