Merge pull request #455 from Zerophase/master

GUI: Add Tab cycling to  TabWidget

1 files changed, 26 insertions, 3 deletions

diff --git a/gui/widgets/tab.cpp b/gui/widgets/tab.cpp
index a8b3f5450d..756781a04b 100644
--- a/gui/widgets/tab.cpp
+++ b/gui/widgets/tab.cpp
@@ -183,6 +183,7 @@ void TabWidget::setActiveTab(int tabID) {
 		}
 		_activeTab = tabID;
 		_firstWidget = _tabs[tabID].firstWidget;
+
 		_boss->draw();
 	}
 }
@@ -226,12 +227,34 @@ void TabWidget::handleMouseDown(int x, int y, int button, int clickCount) {
 }
 
 bool TabWidget::handleKeyDown(Common::KeyState state) {
-	// TODO: maybe there should be a way to switch between tabs
-	// using the keyboard? E.g. Alt-Shift-Left/Right-Arrow or something
-	// like that.
+	if (state.hasFlags(Common::KBD_SHIFT) && state.keycode == Common::KEYCODE_TAB)
+		adjustTabs(kTabBackwards);
+	else if (state.keycode == Common::KEYCODE_TAB)
+		adjustTabs(kTabForwards);
+
 	return Widget::handleKeyDown(state);
 }
 
+void TabWidget::adjustTabs(int value) {
+	// Determine which tab is next
+	int tabID = _activeTab + value;
+	if (tabID >= (int)_tabs.size())
+		tabID = 0;
+	else if (tabID < 0)
+		tabID = ((int)_tabs.size() - 1);
+
+	// Slides _firstVisibleTab forward to the correct tab
+	int maxTabsOnScreen = (_w / _tabWidth);
+	if (tabID >= maxTabsOnScreen && (_firstVisibleTab + maxTabsOnScreen) < (int)_tabs.size())
+		_firstVisibleTab++;
+
+	// Slides _firstVisibleTab backwards to the correct tab
+	while (tabID < _firstVisibleTab)
+		_firstVisibleTab--;
+
+	setActiveTab(tabID);
+}
+
 void TabWidget::reflowLayout() {
 	Widget::reflowLayout();