commit af3e4412d301cc27e04c352c0283ce6861f33f0c
Author:     Simon Howard <fraggle@gmail.com>
AuthorDate: Fri Dec 10 20:43:05 2010 +0000
Commit:     Simon Howard <fraggle@gmail.com>
CommitDate: Fri Dec 10 20:43:05 2010 +0000

    Change alignment of actions in a window's action area so that there is
    equal space either side of the center widget. This is more aesthetically
    pleasing.

    Subversion-branch: /trunk/chocolate-doom
    Subversion-revision: 2208
---
 textscreen/txt_window.c | 39 +++++++++++++++++++++++++++++++--------
 1 file changed, 31 insertions(+), 8 deletions(-)

diff --git a/textscreen/txt_window.c b/textscreen/txt_window.c
index 33f53d4a..46e71d3a 100644
--- a/textscreen/txt_window.c
+++ b/textscreen/txt_window.c
@@ -140,6 +140,15 @@ static void CalcWindowPosition(txt_window_t *window)
 static void LayoutActionArea(txt_window_t *window)
 {
     txt_widget_t *widget;
+    int space_available;
+    int space_left_offset;
+
+    // We need to calculate the available horizontal space for the center
+    // action widget, so that we can center it within it.
+    // To start with, we have the entire action area available.
+
+    space_available = window->window_w;
+    space_left_offset = 0;

     // Left action

@@ -151,29 +160,43 @@ static void LayoutActionArea(txt_window_t *window)

         widget->x = window->window_x + 2;
         widget->y = window->window_y + window->window_h - widget->h - 1;
+
+        // Adjust available space:
+
+        space_available -= widget->w;
+        space_left_offset += widget->w;
     }

-    // Draw the center action
+    // Draw the right action

-    if (window->actions[TXT_HORIZ_CENTER] != NULL)
+    if (window->actions[TXT_HORIZ_RIGHT] != NULL)
     {
-        widget = (txt_widget_t *) window->actions[TXT_HORIZ_CENTER];
+        widget = (txt_widget_t *) window->actions[TXT_HORIZ_RIGHT];

         TXT_CalcWidgetSize(widget);

-        widget->x = window->window_x + (window->window_w - widget->w - 2) / 2;
+        widget->x = window->window_x + window->window_w - 2 - widget->w;
         widget->y = window->window_y + window->window_h - widget->h - 1;
+
+        // Adjust available space:
+
+        space_available -= widget->w;
     }

-    // Draw the right action
+    // Draw the center action

-    if (window->actions[TXT_HORIZ_RIGHT] != NULL)
+    if (window->actions[TXT_HORIZ_CENTER] != NULL)
     {
-        widget = (txt_widget_t *) window->actions[TXT_HORIZ_RIGHT];
+        widget = (txt_widget_t *) window->actions[TXT_HORIZ_CENTER];

         TXT_CalcWidgetSize(widget);

-        widget->x = window->window_x + window->window_w - 2 - widget->w;
+        // The left and right widgets have left a space sandwiched between
+        // them.  Center this widget within that space.
+
+        widget->x = window->window_x
+                  + space_left_offset
+                  + (space_available - widget->w) / 2;
         widget->y = window->window_y + window->window_h - widget->h - 1;
     }
 }