ComboBox - almost working

src/dlangui/widgets/combobox.d

@@ -1,3 +1,30 @@
+// Written in the D programming language.
+
+/**
+This module contains Combo Box widgets implementation.
+
+
+
+Synopsis:
+
+----
+import dlangui.widgets.combobox;
+
+// creation of simple strings list
+ComboBox box = new ComboBox("combo1", ["value 1"d, "value 2"d, "value 3"d]);
+
+// select first item
+box.selectedItemIndex = 0;
+
+// get selected item text
+println(box.text);
+
+----
+
+Copyright: Vadim Lopatin, 2014
+License:   Boost License 1.0
+Authors:   Vadim Lopatin, coolreader.org@gmail.com
+*/
 module dlangui.widgets.combobox;
 
 import dlangui.widgets.widget;
@@ -5,9 +32,11 @@ import dlangui.widgets.layouts;
 import dlangui.widgets.editors;
 import dlangui.widgets.lists;
 import dlangui.widgets.controls;
+import dlangui.widgets.popup;
 
 private import std.algorithm;
 
+/** Abstract ComboBox. */
 class ComboBoxBase : HorizontalLayout, OnClickHandler {
     protected Widget _body;
     protected ImageButton _button;
@@ -15,6 +44,9 @@ class ComboBoxBase : HorizontalLayout, OnClickHandler {
     protected bool _ownAdapter;
     protected int _selectedItemIndex;
 
+    /** Handle item click. */
+    Signal!OnItemSelectedHandler onItemClickListener;
+
     protected Widget createSelectedItemWidget() {
         Widget res;
         if (_adapter && _selectedItemIndex < _adapter.itemCount) {
@@ -34,11 +66,15 @@ class ComboBoxBase : HorizontalLayout, OnClickHandler {
     }
 
     @property void selectedItemIndex(int index) {
+        if (_selectedItemIndex == index)
+            return;
         _selectedItemIndex = index;
+        if (onItemClickListener.assigned)
+            onItemClickListener(this, index);
     }
 
     override bool onClick(Widget source) {
-        // TODO
+        showPopup();
         return true;
     }
 
@@ -48,17 +84,56 @@ class ComboBoxBase : HorizontalLayout, OnClickHandler {
         return res;
     }
 
+    protected ListWidget createPopup() {
+        ListWidget list = new ListWidget("POPUP_LIST");
+        list.adapter = _adapter;
+        list.selectedItemIndex = _selectedItemIndex;
+        return list;
+    }
+
+    protected PopupWidget _popup;
+    protected ListWidget _popupList;
+
+    protected void showPopup() {
+        _popupList = createPopup();
+        _popup = window.showPopup(_popupList, this, PopupAlign.Below | PopupAlign.FitAnchorSize);
+        _popup.flags = PopupFlags.CloseOnClickOutside;
+        _popup.styleId = "POPUP_MENU";
+        _popup.onPopupCloseListener = delegate (PopupWidget source) {
+            _popup = null;
+            _popupList = null;
+        };
+        _popupList.onItemSelectedListener = delegate(Widget source, int index) {
+            selectedItemIndex = index;
+            return true;
+        };
+        _popupList.onItemClickListener = delegate(Widget source, int index) {
+            selectedItemIndex = index;
+            if (_popup !is null)
+                _popup.close();
+            return true;
+        };
+        _popupList.setFocus();
+    }
+
     this(string ID, ListAdapter adapter, bool ownAdapter = true) {
         super(ID);
         _adapter = adapter;
         _ownAdapter = ownAdapter;
         _body = createSelectedItemWidget();
+        _body.onClickListener = this;
         _button = createButton();
+        //_body.state = State.Parent;
+        //focusable = true;
+        _button.focusable = false;
+        _body.focusable = true;
         addChild(_body);
         addChild(_button);
     }
 }
 
+
+/** ComboBox with list of strings. */
 class ComboBox : ComboBoxBase {
     
     protected StringListAdapter _adapter;

src/dlangui/widgets/lists.d

@@ -20,6 +20,7 @@ module dlangui.widgets.lists;
 
 import dlangui.widgets.widget;
 import dlangui.widgets.controls;
+import dlangui.core.signals;
 
 /// list widget adapter provides items for list widgets
 interface ListAdapter {
@@ -155,8 +156,25 @@ class StringListAdapter : ListAdapter {
     }
 }
 
-/// List
+/** interface - slot for onItemSelectedListener */
+interface OnItemSelectedHandler {
+    bool onItemSelected(Widget source, int itemIndex);
+}
+
+/** interface - slot for onItemClickListener */
+interface OnItemClickHandler {
+    bool onItemClick(Widget source, int itemIndex);
+}
+
+
+/** List widget - shows content as hori*/
 class ListWidget : WidgetGroup, OnScrollHandler {
+
+    /** Handle selection change. */
+    Signal!OnItemSelectedHandler onItemSelectedListener;
+    /** Handle item click. */
+    Signal!OnItemSelectedHandler onItemClickListener;
+
     protected Orientation _orientation = Orientation.Vertical;
     /// returns linear layout orientation (Vertical, Horizontal)
     @property Orientation orientation() { return _orientation; }
@@ -308,10 +326,14 @@ class ListWidget : WidgetGroup, OnScrollHandler {
 
 	/// override to handle change of selection
 	protected void selectionChanged(int index, int previouslySelectedItem = -1) {
+        if (onItemSelectedListener.assigned)
+            onItemSelectedListener(this, index);
 	}
 
 	/// override to handle mouse up on item
 	protected void itemClicked(int index) {
+        if (onItemClickListener.assigned)
+            onItemClickListener(this, index);
 	}
 
     protected void updateSelectedItemFocus() {

src/dlangui/widgets/popup.d

@@ -22,6 +22,7 @@ module dlangui.widgets.popup;
 
 import dlangui.widgets.widget;
 import dlangui.widgets.layouts;
+import dlangui.core.signals;
 import dlangui.platforms.common.platform;
 
 /// popup alignment option flags
@@ -34,6 +35,8 @@ enum PopupAlign : uint {
     Right = 4,
 	/// align to specified point
 	Point = 8,
+    /// if popup content size is less than anchor's size, increase it to anchor size
+    FitAnchorSize = 16,
 }
 
 struct PopupAnchor {
@@ -49,17 +52,24 @@ enum PopupFlags : uint {
     CloseOnClickOutside = 1,
 }
 
+/** interface - slot for onPopupCloseListener */
+interface OnPopupCloseHandler {
+    void onPopupClosed(PopupWidget source);
+}
+
 /// popup widget container
 class PopupWidget : LinearLayout {
     protected PopupAnchor _anchor;
     protected bool _modal;
 
     protected uint _flags;
-    protected void delegate(PopupWidget popup) _onPopupCloseListener;
+    /** popup close signal */
+    Signal!OnPopupCloseHandler onPopupCloseListener;
+    //protected void delegate(PopupWidget popup) _onPopupCloseListener;
     /// popup close listener (called right before closing)
-    @property void delegate(PopupWidget popup) onPopupCloseListener() { return _onPopupCloseListener; }
+    //@property void delegate(PopupWidget popup) onPopupCloseListener() { return _onPopupCloseListener; }
     /// set popup close listener (to call right before closing)
-    @property PopupWidget onPopupCloseListener(void delegate(PopupWidget popup) listener) { _onPopupCloseListener = listener; return this; }
+    //@property PopupWidget onPopupCloseListener(void delegate(PopupWidget popup) listener) { _onPopupCloseListener = listener; return this; }
 
     /// returns popup behavior flags (combination of PopupFlags)
     @property uint flags() { return _flags; }
@@ -84,8 +94,8 @@ class PopupWidget : LinearLayout {
 
     /// just call on close listener
     void onClose() {
-        if (_onPopupCloseListener !is null)
-            _onPopupCloseListener(this);
+        if (onPopupCloseListener.assigned)
+            onPopupCloseListener(this);
     }
 
     /// Set widget rectangle to specified value and layout widget contents. (Step 2 of two phase layout).
@@ -124,6 +134,9 @@ class PopupWidget : LinearLayout {
 	            r.left = anchorrc.right;
 	            r.top = anchorrc.top;
 	        }
+            if (anchor.alignment & PopupAlign.FitAnchorSize)
+                if (w < anchorrc.width)
+                    w = anchorrc.width;
 		}
         r.right = r.left + w;
         r.bottom = r.top + h;