Camino only - Bug 426739: Add (undocumented) trackpad swipe support. r/sr=pink

camino/src/browser/BrowserWindowController.mm

@@ -684,6 +684,23 @@ public:
   mMoveReentrant = NO;
 }
 
+// Undocumented method for handling multi-touch swipe events in 10.5.
+// The worst that's likely to happen is that this would just stop being
+// called if the gesture system changes in a future version.
+- (void)swipeWithEvent:(NSEvent*)event
+{
+  // Map forward and back to history; left is positive, right is negative (!)
+  if ([event deltaX] > 0.5)
+    [self back:nil];
+  else if ([event deltaX] < -0.5)
+    [self forward:nil];
+  // Map up and down to page up/down
+  else if ([event deltaY] > 0.5)
+    [[mBrowserView browserView] pageUp];
+  else if ([event deltaY] < -0.5)
+    [[mBrowserView browserView] pageDown];
+}
+
 -(void)autosaveWindowFrame
 {
   if (mShouldAutosave) {

camino/src/embedding/CHBrowserView.h

@@ -255,6 +255,9 @@ typedef enum {
 - (BOOL)canMakeTextSmaller;
 - (BOOL)isTextDefaultSize;
 
+- (void)pageUp;
+- (void)pageDown;
+
 // Verifies that the browser view can be unloaded (e.g., validates
 // onbeforeunload handlers). Should be called before any action that would
 // destroy the browser view.

camino/src/embedding/CHBrowserView.mm

@@ -1274,6 +1274,16 @@ const char kDirServiceContractID[] = "@mozilla.org/file/directory_service;1";
   return (fabsf([self textZoom] - DEFAULT_TEXT_ZOOM) < .001);
 }
 
+- (void)pageUp
+{
+  [self doCommand:"cmd_scrollPageUp"];
+}
+
+- (void)pageDown
+{
+  [self doCommand:"cmd_scrollPageDown"];
+}
+
 - (BOOL)shouldUnload
 {
   nsCOMPtr<nsIContentViewer> contentViewer = dont_AddRef([self contentViewer]);