macosx: add mouse scroll support for fullscreen time slider

modules/gui/macosx/fspanel.h

@@ -76,12 +76,15 @@
 - (void)setVoutWasUpdated: (VLCWindow *)o_window;
 @end
 
+@class VLCProgressView;
+
 @interface VLCFSPanelView : NSView
 {
     NSColor *fillColor;
     NSButton *o_prev, *o_next, *o_bwd, *o_fwd, *o_play, *o_fullscreen;
     NSTextField *o_streamTitle_txt, *o_streamPosition_txt;
     NSSlider *o_fs_timeSlider, *o_fs_volumeSlider;
+    VLCProgressView *o_progress_view;
     NSImage *o_background_img, *o_vol_sld_img, *o_vol_mute_img, *o_vol_max_img, *o_time_sld_img;
     NSTimeInterval last_fwd_event;
     NSTimeInterval last_bwd_event;

modules/gui/macosx/fspanel.m

@@ -417,11 +417,14 @@
     [o_bwd setContinuous:YES];
 
     /* time slider */
-    s_rc = [self frame];
+    // (surrounding progress view for swipe behaviour)
     s_rc.origin.x = 15;
     s_rc.origin.y = 45;
     s_rc.size.width = 518;
     s_rc.size.height = 13;
+    o_progress_view = [[VLCProgressView alloc] initWithFrame: s_rc];
+    s_rc.origin.x = 0;
+    s_rc.origin.y = 0;
     o_fs_timeSlider = [[VLCFSTimeSlider alloc] initWithFrame: s_rc];
     [o_fs_timeSlider setMinValue:0];
     [o_fs_timeSlider setMaxValue:10000];
@@ -431,7 +434,8 @@
     [o_fs_timeSlider setAction: @selector(fsTimeSliderUpdate:)];
     [[o_fs_volumeSlider cell] accessibilitySetOverrideValue:_NS("Position") forAttribute:NSAccessibilityTitleAttribute];
     [[o_fs_timeSlider cell] accessibilitySetOverrideValue:_NS("Click and move the mouse while keeping the button pressed to use this slider to change current playback position.") forAttribute:NSAccessibilityDescriptionAttribute];
-    [self addSubview: o_fs_timeSlider];
+    [self addSubview: o_progress_view];
+    [o_progress_view addSubview: o_fs_timeSlider];
 
     /* volume slider */
     s_rc = [self frame];