tab and tree controls fixes

src/dlangui/core/events.d

@@ -171,6 +171,14 @@ class Action {
         _id = newId;
         return this;
     }
+    /// compares id of this action with another action id
+    bool opEquals(int anotherActionId) const {
+        return _id == anotherActionId;
+    }
+    /// compares id of this action with another action id
+    bool opEquals(const Action action) const {
+        return _id == action._id;
+    }
     /// sets label string resource id
     @property Action label(string resourceId) {
         _label = resourceId;

src/dlangui/core/stdaction.d

@@ -30,29 +30,18 @@ enum StandardAction : int {
     Ignore,
     Open,
     Save,
+    DiscardChanges,
 }
 
-const Action ACTION_OK;
-const Action ACTION_CANCEL;
-const Action ACTION_YES;
-const Action ACTION_NO;
-const Action ACTION_CLOSE;
-const Action ACTION_ABORT;
-const Action ACTION_RETRY;
-const Action ACTION_IGNORE;
-const Action ACTION_OPEN;
-const Action ACTION_SAVE;
+const Action ACTION_OK = new Action(StandardAction.Ok, "ACTION_OK"c);
+const Action ACTION_CANCEL = new Action(StandardAction.Cancel, "ACTION_CANCEL"c);
+const Action ACTION_YES = new Action(StandardAction.Yes, "ACTION_YES"c);
+const Action ACTION_NO = new Action(StandardAction.No, "ACTION_NO"c);
+const Action ACTION_CLOSE = new Action(StandardAction.Close, "ACTION_CLOSE"c);
+const Action ACTION_ABORT =  new Action(StandardAction.Abort, "ACTION_ABORT"c);
+const Action ACTION_RETRY = new Action(StandardAction.Retry, "ACTION_RETRY"c);
+const Action ACTION_IGNORE = new Action(StandardAction.Ignore, "ACTION_IGNORE"c);
+const Action ACTION_OPEN = new Action(StandardAction.Open, "ACTION_OPEN"c);
+const Action ACTION_SAVE = new Action(StandardAction.Save, "ACTION_SAVE"c);
+const Action ACTION_DISCARD_CHANGES = new Action(StandardAction.DiscardChanges, "ACTION_DISCARD_CHANGES"c);
 
-static this()
-{
-  ACTION_OK = new Action(StandardAction.Ok, "ACTION_OK"c);
-  ACTION_CANCEL = cast(immutable(Action)) new Action(StandardAction.Cancel, "ACTION_CANCEL"c);
-  ACTION_YES = cast(immutable(Action)) new Action(StandardAction.Yes, "ACTION_YES"c);
-  ACTION_NO = cast(immutable(Action)) new Action(StandardAction.No, "ACTION_NO"c);
-  ACTION_CLOSE = cast(immutable(Action)) new Action(StandardAction.Close, "ACTION_CLOSE"c);
-  ACTION_ABORT = cast(immutable(Action)) new Action(StandardAction.Abort, "ACTION_ABORT"c);
-  ACTION_RETRY = cast(immutable(Action)) new Action(StandardAction.Retry, "ACTION_RETRY"c);
-  ACTION_IGNORE = cast(immutable(Action)) new Action(StandardAction.Ignore, "ACTION_IGNORE"c);
-  ACTION_OPEN = cast(immutable(Action)) new Action(StandardAction.Open, "ACTION_OPEN"c);
-  ACTION_SAVE = cast(immutable(Action)) new Action(StandardAction.Save, "ACTION_SAVE"c);
-}

src/dlangui/widgets/tabs.d

@@ -26,10 +26,18 @@ import dlangui.core.signals;
 import dlangui.widgets.layouts;
 import dlangui.widgets.controls;
 
+import std.algorithm;
+
+/// current tab is changed handler
 interface TabHandler {
     void onTabChanged(string newActiveTabId, string previousTabId);
 }
 
+/// tab close button pressed handler
+interface TabCloseHandler {
+    void onTabClose(string tabId);
+}
+
 
 /// tab item metadata
 class TabItem {
@@ -86,6 +94,7 @@ class TabItemWidget : HorizontalLayout {
     private ImageButton _closeButton;
     private TabItem _item;
     private bool _enableCloseButton;
+    Signal!TabCloseHandler onTabCloseListener;
     @property TabItem tabItem() { return _item; }
     @property TabControl tabControl() { return cast(TabControl)parent; }
     this(TabItem item, bool enableCloseButton = true) {
@@ -119,6 +128,8 @@ class TabItemWidget : HorizontalLayout {
     protected bool onClick(Widget source) {
         if (source.compareId("CLOSE")) {
             Log.d("tab close button pressed");
+            if (onTabCloseListener.assigned)
+                onTabCloseListener(_item.id);
         }
         return true;
     }
@@ -217,6 +228,9 @@ class TabControl : WidgetGroupDefaultDrawing {
 	/// signal of tab change (e.g. by clicking on tab header)
 	Signal!TabHandler onTabChangedListener;
 
+    /// signal on tab close button
+    Signal!TabCloseHandler onTabCloseListener;
+
     /// empty parameter list constructor - for usage by factory
     this() {
         this(null);
@@ -299,12 +313,29 @@ class TabControl : WidgetGroupDefaultDrawing {
 
     /// remove tab
     TabControl removeTab(string id) {
+        string nextId;
+        if (id.equal(_selectedTabId)) {
+            // current tab is being closed: remember next tab id
+            int nextIndex = getNextItemIndex(1);
+            if (nextIndex < 0)
+                nextIndex = getNextItemIndex(-1);
+            if (nextIndex >= 0)
+                nextId = _items[nextIndex].id;
+        }
         int index = _items.indexById(id);
         if (index >= 0) {
             _children.remove(index + 1);
             _items.remove(index);
+            if (id.equal(_selectedTabId))
+                _selectedTabId = null;
             requestLayout();
         }
+        if (nextId) {
+            index = _items.indexById(nextId);
+            if (index >= 0) {
+                selectTab(index, true);
+            }
+        }
         return this;
     }
 
@@ -329,6 +360,10 @@ class TabControl : WidgetGroupDefaultDrawing {
         }
     }
 
+    protected void onTabClose(string tabId) {
+        if (onTabCloseListener.assigned)
+            onTabCloseListener(tabId);
+    }
 
     /// add new tab
     TabControl addTab(TabItem item, int index = -1, bool enableCloseButton = false) {
@@ -337,6 +372,7 @@ class TabControl : WidgetGroupDefaultDrawing {
         widget.parent = this;
         widget.onClickListener = &onClick;
         widget.setStyles(_tabButtonStyle, _tabButtonTextStyle);
+        widget.onTabCloseListener = &onTabClose;
         _children.insert(widget, index);
         updateTabs();
         requestLayout();
@@ -440,6 +476,10 @@ class TabControl : WidgetGroupDefaultDrawing {
 
     protected string _selectedTabId;
 
+    @property string selectedTabId() const {
+        return _selectedTabId;
+    }
+
     void updateAccessTs() {
         int index = _items.indexById(_selectedTabId);
         if (index >= 0)
@@ -566,7 +606,7 @@ class TabHost : FrameLayout, TabHandler {
 
 
 /// compound widget - contains from TabControl widget (tabs header) and TabHost (content pages)
-class TabWidget : VerticalLayout, TabHandler {
+class TabWidget : VerticalLayout, TabHandler, TabCloseHandler {
     protected TabControl _tabControl;
     protected TabHost _tabHost;
     /// empty parameter list constructor - for usage by factory
@@ -579,6 +619,7 @@ class TabWidget : VerticalLayout, TabHandler {
         _tabControl = new TabControl("TAB_CONTROL");
         _tabHost = new TabHost("TAB_HOST", _tabControl);
 		_tabControl.onTabChangedListener.connect(this);
+		_tabControl.onTabCloseListener.connect(this);
         styleId = STYLE_TAB_WIDGET;
         addChild(_tabControl);
         addChild(_tabHost);
@@ -587,6 +628,13 @@ class TabWidget : VerticalLayout, TabHandler {
 
 	/// signal of tab change (e.g. by clicking on tab header)
 	Signal!TabHandler onTabChangedListener;
+    /// signal on tab close button
+    Signal!TabCloseHandler onTabCloseListener;
+
+    protected override void onTabClose(string tabId) {
+        if (onTabCloseListener.assigned)
+            onTabCloseListener(tabId);
+    }
 
     protected override void onTabChanged(string newActiveTabId, string previousTabId) {
         // forward to listener

src/dlangui/widgets/tree.d

@@ -738,9 +738,15 @@ class TreeWidgetBase :  ScrollWidget, OnTreeContentChangeListener, OnTreeStateCh
         }
     }
 
+    void clearSelection() {
+        _tree.selectItem(null);
+    }
+
     void selectItem(TreeItem item, bool makeVisible = true) {
-        if (!item)
+        if (!item) {
+            clearSelection();
             return;
+        }
         _tree.selectItem(item);
         if (makeVisible)
             makeItemVisible(item);

views/res/i18n/std_en.ini

@@ -10,3 +10,4 @@ ACTION_RETRY=Retry
 ACTION_IGNORE=Ignore
 ACTION_OPEN=Open
 ACTION_SAVE=Save
+ACTION_DISCARD_CHANGES=Discard changes

views/res/theme_default.xml

@@ -111,6 +111,7 @@
         >
     </style>
     <style id="TAB_UP_BUTTON_DARK"
+        padding="5,1,1,1"
         backgroundImageId="tab_btn_dark_up"
         />
     <style id="TAB_UP_BUTTON_DARK_TEXT"