[iOS] Enable scrolling with a two fingers panning gesture

applidium · Dec 21, 2011 · 461e623 · 461e623
1 parent 77b0244
commit 461e623
Show file tree

Hide file tree

Showing 2 changed files with 43 additions and 0 deletions.
diff --git a/src/gui_ios.m b/src/gui_ios.m
@@ -133,9 +133,17 @@ - (void)viewDidLoad {
     [tapGestureRecognizer release];
 
     UIPanGestureRecognizer * panGestureRecognizer = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(pan:)];
+    panGestureRecognizer.minimumNumberOfTouches = 1;
+    panGestureRecognizer.maximumNumberOfTouches = 1;
     [_textView addGestureRecognizer:panGestureRecognizer];
     [panGestureRecognizer release];
 
+    UIPanGestureRecognizer * scrollGestureRecognizer = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(scroll:)];
+    scrollGestureRecognizer.minimumNumberOfTouches = 2;
+    scrollGestureRecognizer.maximumNumberOfTouches = 2;
+    [_textView addGestureRecognizer:scrollGestureRecognizer];
+    [scrollGestureRecognizer release];
+
     [[NSNotificationCenter defaultCenter] addObserver:self
                                              selector:@selector(keyboardWasShown:)
                                                  name:UIKeyboardDidShowNotification object:nil];
@@ -219,6 +227,36 @@ - (void)pan:(UIPanGestureRecognizer *)sender {
     gui_send_mouse_event(event, clickLocation.x, clickLocation.y, 1, 0);
 }
 
+- (void)scroll:(UIPanGestureRecognizer *)sender {
+    CGPoint clickLocation = [sender locationInView:sender.view];
+    CGPoint translation = [sender translationInView:sender.view];
+    static int totalScrollX = 0;
+    static int totalScrollY = 0;
+    if (sender.state == UIGestureRecognizerStateBegan) {
+        totalScrollX = 0;
+        totalScrollY = 0;
+    }
+    int targetScrollX = translation.x / gui.char_width;
+    int targetScrollY = translation.y / gui.char_height;
+
+    while (targetScrollX < totalScrollX) {
+        gui_send_mouse_event(MOUSE_6, clickLocation.x, clickLocation.y, 0, 0);
+        totalScrollX--;
+    }
+    while (targetScrollX > totalScrollX) {
+        gui_send_mouse_event(MOUSE_7, clickLocation.x, clickLocation.y, 0, 0);
+        totalScrollX++;
+    }
+    while (targetScrollY < totalScrollY) {
+        gui_send_mouse_event(MOUSE_5, clickLocation.x, clickLocation.y, 0, 0);
+        totalScrollY--;
+    }
+    while (targetScrollY > totalScrollY) {
+        gui_send_mouse_event(MOUSE_4, clickLocation.x, clickLocation.y, 0, 0);
+        totalScrollY++;
+    }
+}
+
 - (void)keyboardWasShown:(NSNotification *)notification {
     CGRect keyboardRect = [[[notification userInfo] objectForKey:UIKeyboardFrameEndUserInfoKey] CGRectValue];
     CGRect keyboardRectInView = [self.view.window convertRect:keyboardRect toView:_textView];
@@ -414,6 +452,10 @@ int main(int argc, char *argv[]) {
     gui.def_norm_pixel = gui.norm_pixel;
     gui.def_back_pixel = gui.back_pixel;
 
+#ifdef FEAT_GUI_SCROLL_WHEEL_FORCE
+    gui.scroll_wheel_force = 1;
+#endif
+
     return OK;
 }
 

diff --git a/src/os_ios_rsrc/ios_prefix.pch b/src/os_ios_rsrc/ios_prefix.pch
@@ -9,6 +9,7 @@
 #define HAVE_OPENDIR 1
 #define MACOS_X_UNIX 1
 #define ALWAYS_USE_GUI 1
+#define FEAT_GUI_SCROLL_WHEEL_FORCE 1
 
 #ifndef __IPHONE_3_0
 #warning "This project uses features only available in iPhone SDK 3.0 and later."