Implement SwitchWidget - close issue #205

examples/example1/src/example1.d

@@ -567,6 +567,11 @@ extern (C) int UIAppMain(string[] args) {
             buttons10.addChild(new TextWidget(null, "ImageTextButton widgets: "d));
             buttons10.addChild(new ImageTextButton("btn5", "text-plain", "Enabled"d));
             buttons10.addChild((new ImageTextButton("btn6", "folder", "Disabled"d)).enabled(false));
+            buttons10.addChild(new TextWidget(null, "SwitchWidget widgets: "d));
+            buttons10.addChild((new SwitchWidget("SW1")).checked(true));
+            buttons10.addChild((new SwitchWidget("SW2")).checked(false));
+            buttons10.addChild((new SwitchWidget("SW3")).checked(true).enabled(false));
+            buttons10.addChild((new SwitchWidget("SW4")).checked(false).enabled(false));
             layout3.addChild(buttons10);
 
             WidgetGroup buttons11 = new HorizontalLayout();

src/dlangui/widgets/controls.d

@@ -159,6 +159,49 @@ class MultilineTextWidget : TextWidget {
     }
 }
 
+/// Switch (on/off) widget
+class SwitchWidget : Widget {
+    this(string ID = null) {
+        super(ID);
+        styleId = STYLE_SWITCH;
+        clickable = true;
+        focusable = true;
+        trackHover = true;
+    }
+    // called to process click and notify listeners
+    override protected bool handleClick() {
+        checked = !checked;
+        return super.handleClick();
+    }
+    override void measure(int parentWidth, int parentHeight) { 
+        DrawableRef img = backgroundDrawable;
+        int w = 0;
+        int h = 0;
+        if (!img.isNull) {
+            w = img.width;
+            h = img.height;
+        }
+        measuredContent(parentWidth, parentHeight, w, h);
+    }
+
+    override void onDraw(DrawBuf buf) {
+        if (visibility != Visibility.Visible)
+            return;
+        Rect rc = _pos;
+        applyMargins(rc);
+        auto saver = ClipRectSaver(buf, rc, alpha);
+        DrawableRef img = backgroundDrawable;
+        if (!img.isNull) {
+            Point sz;
+            sz.x = img.width;
+            sz.y = img.height;
+            applyAlign(rc, sz);
+            uint st = state;
+            img.drawTo(buf, rc, st);
+        }
+    }
+}
+
 /// static image widget
 class ImageWidget : Widget {
 

src/dlangui/widgets/styles.d

@@ -49,6 +49,8 @@ immutable string STYLE_BUTTON_IMAGE = "BUTTON_IMAGE";
 immutable string STYLE_BUTTON_TRANSPARENT = "BUTTON_TRANSPARENT";
 /// style id for Button w/o margins
 immutable string STYLE_BUTTON_NOMARGINS = "BUTTON_NOMARGINS";
+/// standard style id for Switch
+immutable string STYLE_SWITCH = "SWITCH";
 /// standard style id for CheckBox
 immutable string STYLE_CHECKBOX = "CHECKBOX";
 /// standard style id for CheckBox image

views/res/switch.xml

@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="utf-8"?>
+<selector xmlns:android="http://schemas.android.com/apk/res/android">
+    <item android:state_checked="false" android:state_enabled="true"
+          android:drawable="@drawable/switch_off" />
+    <item android:state_checked="true" android:state_enabled="true"
+          android:drawable="@drawable/switch_on" />
+    <item android:state_checked="false" android:drawable="@drawable/switch_off_disabled" />
+    <item android:state_checked="true" android:drawable="@drawable/switch_on_disabled" />
+</selector>
+

views/res/theme_default.xml

@@ -66,6 +66,11 @@
         margins="2,2,2,2"
         align="Center"
         />
+    <style id="SWITCH"
+        margins="2,2,2,2"
+        align="Center"
+        backgroundImageId="switch"
+        />
     <style id="CHECKBOX"
         backgroundImageId="@null"
         margins="2,2,2,2"

views/standard_resources.list

@@ -169,6 +169,10 @@ res/mdpi/folder.png
 res/mdpi/media-flash-sd-mmc.png
 res/mdpi/popup_window_background.9.png
 res/mdpi/popup_window_background_dark.9.png
+res/mdpi/switch_off.png
+res/mdpi/switch_off_disabled.png
+res/mdpi/switch_on.png
+res/mdpi/switch_on_disabled.png
 res/mdpi/tab_btn_dark_down_focused.9.png
 res/mdpi/tab_btn_dark_down_focused_dark.9.png
 res/mdpi/tab_btn_dark_down_focused_selected.9.png
@@ -234,6 +238,7 @@ res/scrollbar_btn_up.png
 res/scrollbar_btn_up_dark.png
 res/scrollbar_indicator_horizontal.png
 res/scrollbar_indicator_vertical.png
+res/switch.xml
 res/tab_btn_dark_down.xml
 res/tab_btn_dark_down_dark.xml
 res/tab_btn_dark_up.xml