[iortcw] 92/95: All: Add mouse wheel support to UI list boxes

[Simon McVittie]

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smcv pushed a commit to tag 1.51
in repository iortcw.

commit ea30c07df52748f2791e92643e0e980da9d33357
Author: MAN-AT-ARMS <M4N4T4RMS at gmail.com>
Date:   Sun Jun 4 08:43:26 2017 -0400

    All: Add mouse wheel support to UI list boxes
---
 MP/code/ui/ui_shared.c | 21 +++++++++++++++++++++
 SP/code/ui/ui_shared.c | 21 +++++++++++++++++++++
 2 files changed, 42 insertions(+)

diff --git a/MP/code/ui/ui_shared.c b/MP/code/ui/ui_shared.c
index dd65d0b..ca40216 100644
--- a/MP/code/ui/ui_shared.c
+++ b/MP/code/ui/ui_shared.c
@@ -2213,6 +2213,27 @@ qboolean Item_ListBox_HandleKey( itemDef_t *item, int key, qboolean down, qboole
 				return qtrue;
 			}
 		}
+
+		// Use mouse wheel in vertical and horizontal menus.
+		// If scrolling 3 items would replace over half of the
+		// displayed items, only scroll 1 item at a time.
+		if ( key == K_MWHEELUP ) {
+			int scroll = viewmax < 6 ? 1 : 3;
+			listPtr->startPos -= scroll;
+			if (listPtr->startPos < 0) {
+				listPtr->startPos = 0;
+			}
+			return qtrue;
+		}
+		if ( key == K_MWHEELDOWN ) {
+			int scroll = viewmax < 6 ? 1 : 3;
+			listPtr->startPos += scroll;
+			if (listPtr->startPos > max) {
+				listPtr->startPos = max;
+			}
+			return qtrue;
+		}
+
 		// mouse hit
 		if ( key == K_MOUSE1 || key == K_MOUSE2 ) {
 			if ( item->window.flags & WINDOW_LB_LEFTARROW ) {
diff --git a/SP/code/ui/ui_shared.c b/SP/code/ui/ui_shared.c
index c7f5545..5fff5c4 100644
--- a/SP/code/ui/ui_shared.c
+++ b/SP/code/ui/ui_shared.c
@@ -2206,6 +2206,27 @@ qboolean Item_ListBox_HandleKey( itemDef_t *item, int key, qboolean down, qboole
 				return qtrue;
 			}
 		}
+
+		// Use mouse wheel in vertical and horizontal menus.
+		// If scrolling 3 items would replace over half of the
+		// displayed items, only scroll 1 item at a time.
+		if ( key == K_MWHEELUP ) {
+			int scroll = viewmax < 6 ? 1 : 3;
+			listPtr->startPos -= scroll;
+			if (listPtr->startPos < 0) {
+				listPtr->startPos = 0;
+			}
+			return qtrue;
+		}
+		if ( key == K_MWHEELDOWN ) {
+			int scroll = viewmax < 6 ? 1 : 3;
+			listPtr->startPos += scroll;
+			if (listPtr->startPos > max) {
+				listPtr->startPos = max;
+			}
+			return qtrue;
+		}
+
 		// mouse hit
 		if ( key == K_MOUSE1 || key == K_MOUSE2 ) {
 			if ( item->window.flags & WINDOW_LB_LEFTARROW ) {

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