[ios] get the current Side buttons available size

This size is used to update the side buttons during the modally search screen dragging

Signed-off-by: Kiryl Kaveryn <kirylkaveryn@gmail.com>

iphone/Maps/Classes/CustomViews/MapViewControls/SideButtons/MWMSideButtons.h

@@ -14,5 +14,6 @@
 - (void)processMyPositionStateModeEvent:(MWMMyPositionMode)mode;
 
 + (void)updateAvailableArea:(CGRect)frame;
++ (CGRect)getAvailableArea;
 
 @end

iphone/Maps/Classes/CustomViews/MapViewControls/SideButtons/MWMSideButtons.mm

@@ -57,6 +57,9 @@ NSString * const kUDDidShowLongTapToShowSideButtonsToast = @"kUDDidShowLongTapTo
 }
 
 + (void)updateAvailableArea:(CGRect)frame { [[self buttons].sideView updateAvailableArea:frame]; }
+
++ (CGRect)getAvailableArea { return [self buttons].sideView.getAvailableArea; }
+
 - (void)zoomIn
 {
   GetFramework().Scale(Framework::SCALE_MAG, true);

iphone/Maps/Classes/CustomViews/MapViewControls/SideButtons/MWMSideButtonsView.h

@@ -8,5 +8,6 @@
 - (void)setHidden:(BOOL)hidden animated:(BOOL)animated;
 
 - (void)updateAvailableArea:(CGRect)frame;
+- (CGRect)getAvailableArea;
 
 @end

iphone/Maps/Classes/CustomViews/MapViewControls/SideButtons/MWMSideButtonsView.mm

@@ -144,6 +144,10 @@ CGFloat const kButtonsBottomOffset = 6;
   [self setNeedsLayout];
 }
 
+- (CGRect)getAvailableArea {
+  return self.availableArea;
+}
+
 - (CGFloat)availableHeight {
   return self.availableArea.size.height - kButtonsTopOffset - kButtonsBottomOffset;
 }