Merge pull request #7933 from RebelliousX/2.1

TabContainer's signal changes (v2.1)

doc/base/classes.xml

@@ -39867,13 +39867,21 @@
 			<return type="int">
 			</return>
 			<description>
-				Return the current tab that is being showed.
+				Return the current tab index that is being shown.
+			</description>
+		</method>
+		<method name="get_previous_tab" qualifiers="const">
+			<return type="int">
+			</return>
+			<description>
+				Return the previous tab index that was being shown.
  			</description>
  		</method>
 		<method name="get_current_tab_control" qualifiers="const">
 			<return type="Control">
 			</return>
 			<description>
+				Return the current tab control that is being shown.
 			</description>
 		</method>
 		<method name="get_popup" qualifiers="const">
@@ -39976,7 +39984,14 @@
 			<argument index="0" name="tab" type="int">
 			</argument>
 			<description>
-				Emitted when the current tab changes.
+				Emitted when a tab gets selected. Same behavior as [tab_selected] signal for backward compatibility. Note: In Godot v3.0+ this will change to be only emitted when tab gets changed.
+			</description>
+		</signal>
+		<signal name="tab_selected">
+			<argument index="0" name="tab" type="int">
+			</argument>
+			<description>
+				Emitted when a tab is being selected, even if it is the same tab.
  			</description>
  		</signal>
 	</signals>

scene/gui/tab_container.cpp

@@ -416,6 +416,7 @@ void TabContainer::add_child_notify(Node *p_child) {
 		//call_deferred("set_current_tab",0);
 		first = true;
 		current = 0;
+		previous = 0;
 	}
 	c->set_area_as_parent_rect();
 	if (tabs_visible)
@@ -451,6 +452,7 @@ void TabContainer::set_current_tab(int p_current) {
 
 	ERR_FAIL_INDEX( p_current, get_tab_count() );
 
+	int pending_previous = current;
 	current = p_current;
 
 	int idx=0;
@@ -478,7 +480,13 @@ void TabContainer::set_current_tab(int p_current) {
 	}
 
 	_change_notify("current_tab");
+	
+	if (pending_previous != current)
+		previous = pending_previous;
+
+	emit_signal("tab_selected", current);
 	emit_signal("tab_changed", current);
+
 	update();
 }
 
@@ -487,6 +495,11 @@ int TabContainer::get_current_tab() const {
 	return current;
 }
 
+int TabContainer::get_previous_tab() const {
+	
+		return previous;
+}
+
 Control* TabContainer::get_tab_control(int p_idx) const {
 
 	int idx=0;
@@ -508,6 +521,7 @@ Control* TabContainer::get_tab_control(int p_idx) const {
 
 	return NULL;
 }
+
 Control* TabContainer::get_current_tab_control() const {
 
 	int idx=0;
@@ -555,6 +569,7 @@ void TabContainer::set_tab_align(TabAlign p_align) {
 
 	_change_notify("tab_align");
 }
+
 TabContainer::TabAlign TabContainer::get_tab_align() const {
 
 	return align;
@@ -715,6 +730,7 @@ void TabContainer::_bind_methods() {
 	ObjectTypeDB::bind_method(_MD("get_tab_count"), &TabContainer::get_tab_count);
 	ObjectTypeDB::bind_method(_MD("set_current_tab","tab_idx"), &TabContainer::set_current_tab);
 	ObjectTypeDB::bind_method(_MD("get_current_tab"), &TabContainer::get_current_tab);
+	ObjectTypeDB::bind_method(_MD("get_previous_tab"), &TabContainer::get_previous_tab);
 	ObjectTypeDB::bind_method(_MD("get_current_tab_control:Control"), &TabContainer::get_current_tab_control);
 	ObjectTypeDB::bind_method(_MD("get_tab_control:Control","idx"), &TabContainer::get_tab_control);
 	ObjectTypeDB::bind_method(_MD("set_tab_align","align"), &TabContainer::set_tab_align);
@@ -731,6 +747,7 @@ void TabContainer::_bind_methods() {
 	ObjectTypeDB::bind_method(_MD("_child_renamed_callback"), &TabContainer::_child_renamed_callback);
 
 	ADD_SIGNAL(MethodInfo("tab_changed", PropertyInfo(Variant::INT, "tab")));
+	ADD_SIGNAL(MethodInfo("tab_selected", PropertyInfo(Variant::INT, "tab")));
 	ADD_SIGNAL(MethodInfo("pre_popup_pressed"));
 
 	ADD_PROPERTY( PropertyInfo(Variant::INT, "tab_align", PROPERTY_HINT_ENUM,"Left,Center,Right"), _SCS("set_tab_align"), _SCS("get_tab_align") );
@@ -745,6 +762,7 @@ TabContainer::TabContainer() {
 	buttons_visible_cache = false;
 	tabs_ofs_cache = 0;
 	current = 0;
+	previous = 0;
 	mouse_x_cache = 0;
 	align = ALIGN_CENTER;
 	tabs_visible = true;

scene/gui/tab_container.h

@@ -50,6 +50,7 @@ private:
 	int tabs_ofs_cache;
 	int last_tab_cache;
 	int current;
+	int previous;
 	bool tabs_visible;
 	bool buttons_visible_cache;
 	TabAlign align;
@@ -86,6 +87,7 @@ public:
 	int get_tab_count() const;
 	void set_current_tab(int p_current);
 	int get_current_tab() const;
+	int get_previous_tab() const;
 	
 	Control* get_tab_control(int p_idx) const;
 	Control* get_current_tab_control() const;