scrollbar control, part 1

src/dlangui/widgets/controls.d

@@ -53,8 +53,9 @@ class ImageWidget : Widget {
     protected string _drawableId;
     protected DrawableRef _drawable;
 
-    this(string ID = null) {
+    this(string ID = null, string drawableId = null) {
 		super(ID);
+        _drawableId = drawableId;
 	}
 
     /// get drawable image id
@@ -110,6 +111,14 @@ class ImageWidget : Widget {
     }
 }
 
+/// button with image only
+class ImageButton : ImageWidget {
+    this(string ID = null, string drawableId = null) {
+        super(ID);
+        styleId = "BUTTON";
+    }
+}
+
 class Button : Widget {
     protected dstring _text;
     override @property dstring text() { return _text; }
@@ -118,6 +127,7 @@ class Button : Widget {
 		super(ID);
         styleId = "BUTTON";
     }
+
     override void measure(int parentWidth, int parentHeight) { 
         FontRef font = font();
         Point sz = font.textSize(text);
@@ -138,3 +148,44 @@ class Button : Widget {
     }
 
 }
+
+/// scroll bar - either vertical or horizontal
+class ScrollBar : WidgetGroup {
+    protected ImageButton _btnBack;
+    protected ImageButton _btnForward;
+
+    protected Orientation _orientation = Orientation.Vertical;
+    /// returns scrollbar orientation (Vertical, Horizontal)
+    @property Orientation orientation() { return _orientation; }
+    /// sets scrollbar orientation
+    @property ScrollBar orientation(Orientation value) { 
+        if (_orientation != value) {
+            _orientation = value; 
+            _btnBack.drawableId = _orientation == Orientation.Vertical ? "scrollbar_btn_up" : "scrollbar_btn_left";
+            _btnForward.drawableId = _orientation == Orientation.Vertical ? "scrollbar_btn_down" : "scrollbar_btn_right";
+            requestLayout(); 
+        }
+        return this; 
+    }
+
+    this(string ID = null, Orientation orientation = Orientation.Vertical) {
+		super(ID);
+        styleId = "BUTTON";
+        _orientation = orientation;
+        _btnBack = new ImageButton("BACK", _orientation == Orientation.Vertical ? "scrollbar_btn_up" : "scrollbar_btn_left");
+        _btnForward = new ImageButton("FORWARD", _orientation == Orientation.Vertical ? "scrollbar_btn_down" : "scrollbar_btn_right");
+    }
+
+    override void measure(int parentWidth, int parentHeight) { 
+        Point sz;
+        _btnBack.measure(parentWidth, parentHeight);
+        _btnForward.measure(parentWidth, parentHeight);
+        if (_orientation == Orientation.Vertical) {
+            // vertical
+        } else {
+            // horizontal
+
+        }
+        measuredContent(parentWidth, parentHeight, sz.x, sz.y);
+    }
+}

src/dlangui/widgets/layouts.d

@@ -2,11 +2,6 @@ module dlangui.widgets.layouts;
 
 import dlangui.widgets.widget;
 
-enum Orientation : ubyte {
-    Vertical,
-    Horizontal
-}
-
 /// helper for layouts
 struct LayoutItem {
 	Widget _widget;

src/dlangui/widgets/widget.d

@@ -26,6 +26,11 @@ enum Visibility : ubyte {
     Gone
 }
 
+enum Orientation : ubyte {
+    Vertical,
+    Horizontal
+}
+
 class Widget {
     /// widget id
     protected string _id;
@@ -480,7 +485,7 @@ class Widget {
     /// returns parent widget, null for top level widget
     @property Widget parent() { return _parent; }
     /// sets parent for widget
-    @property void parent(Widget parent) { _parent = parent; }
+    @property Widget parent(Widget parent) { _parent = parent; return this; }
     /// returns window (if widget or its parent is attached to window)
     @property Window window() {
         Widget p = this;
@@ -558,7 +563,7 @@ class WidgetGroup : Widget {
     /// returns child by index
     override Widget child(int index) { return _children.get(index); }
     /// adds child, returns added item
-    override Widget addChild(Widget item) { return _children.add(item); }
+    override Widget addChild(Widget item) { return _children.add(item).parent(this); }
     /// removes child, returns added item
     override Widget removeChild(int index) { return _children.remove(index); }
     /// returns index of widget in child list, -1 if passed widget is not a child of this widget