scrollbar, options and widgets changes

* complete scrollbar skin
* implement scrollbar functionality (scrolling with mouse)
* fix onMouseClick issues
* add tabs in options (graphics and general tab)
* add new option for limiting frame rate using scrollbar
* add new widget property "clipping" that will be used on scrollable areas

modules/client_entergame/characterlist.otui

@@ -28,6 +28,7 @@ MainWindow
     anchors.top: characterList.top
     anchors.bottom: characterList.bottom
     anchors.right: characterList.right
+    maximum: 0
 
   Label
     id: accountStatusLabel

modules/client_options/general.otui

@@ -0,0 +1,28 @@
+Panel
+  OptionCheckBox
+    id: classicControl
+    text: Classic control
+
+  OptionCheckBox
+    id: showInfoMessagesInConsole
+    text: Show info messages in console
+
+  OptionCheckBox
+    id: showEventMessagesInConsole
+    text: Show event messages in console
+
+  OptionCheckBox
+    id: showStatusMessagesInConsole
+    text: Show status messages in console
+
+  OptionCheckBox
+    id: showTimestampsInConsole
+    text: Show timestamps in console
+
+  OptionCheckBox
+    id: showLevelsInConsole
+    text: Show levels in console
+
+  OptionCheckBox
+    id: showPrivateMessagesInConsole
+    text: Show private messages in console

modules/client_options/graphics.otui

@@ -0,0 +1,32 @@
+Panel
+  OptionCheckBox
+    id: vsync
+    text: Enable vertical synchronization
+    tooltip: Limits FPS to 60
+
+  OptionCheckBox
+    id: showfps
+    text: Show frame rate
+
+  OptionCheckBox
+    id: fullscreen
+    text: Fullscreen
+
+  Label
+    text: Frame rate limit
+    anchors.left: parent.left
+    anchors.right: parent.right
+    anchors.top: prev.bottom
+    margin-top: 6
+
+  HorizontalScrollBar
+    id: frameRateScrollBar
+    anchors.left: parent.left
+    anchors.right: parent.right
+    anchors.top: prev.bottom
+    margin-top: 3
+    minimum: 0
+    maximum: 50
+    value: 0
+    step: 1
+    @onValueChange: g_app.setFrameSleep(self:getValue())

modules/client_options/options.lua

@@ -2,6 +2,7 @@ Options = {}
 
 local optionsWindow
 local optionsButton
+local optionsTabBar
 local options = { vsync = true,
                   showfps = true,
                   fullscreen = false,
@@ -22,18 +23,24 @@ function Options.init()
     end
   end
 
+  Keyboard.bindKeyDown('Ctrl+P', Options.toggle)
+
   optionsWindow = displayUI('options.otui')
   optionsWindow:hide()
   optionsButton = TopMenu.addLeftButton('optionsButton', 'Options (Ctrl+O)', 'options.png', Options.toggle)
-  Keyboard.bindKeyDown('Ctrl+O', Options.toggle)
+  optionsTabBar = optionsWindow:getChildById('optionsTabBar')
+  optionsTabBar:setContentWidget(optionsWindow:getChildById('optionsTabContent'))
+  optionsTabBar:addTab('General', loadUI('general.otui'))
+  optionsTabBar:addTab('Graphics', loadUI('graphics.otui'))
 end
 
 function Options.terminate()
-  Keyboard.unbindKeyDown('Ctrl+O')
+  Keyboard.unbindKeyDown('Ctrl+P')
   optionsWindow:destroy()
   optionsWindow = nil
   optionsButton:destroy()
   optionsButton = nil
+  optionsTabBar = nil
   Options = nil
 end
 

modules/client_options/options.otui

@@ -16,51 +16,24 @@ OptionCheckBox < CheckBox
 MainWindow
   id: optionsWindow
   text: Options
-  size: 286 250
+  size: 286 200
 
   @onEnter: Options.hide()
   @onEscape: Options.hide()
 
-  OptionCheckBox
+  TabBar
-    id: vsync
+    id: optionsTabBar
-    text: Enable vertical synchronization
+    anchors.top: parent.top
-    tooltip: Limits FPS to 60
+    anchors.left: parent.left
+    anchors.right: parent.right
 
-  OptionCheckBox
+  Panel
-    id: showfps
+    id: optionsTabContent
-    text: Show frame rate
+    anchors.top: optionsTabBar.bottom
-
+    anchors.left: parent.left
-  OptionCheckBox
+    anchors.right: parent.right
-    id: fullscreen
+    anchors.bottom: parent.bottom
-    text: Fullscreen
+    margin-top: 10
-
-  OptionCheckBox
-    id: classicControl
-    text: Classic control
-
-  OptionCheckBox
-    id: showInfoMessagesInConsole
-    text: Show info messages in console
-
-  OptionCheckBox
-    id: showEventMessagesInConsole
-    text: Show event messages in console
-
-  OptionCheckBox
-    id: showStatusMessagesInConsole
-    text: Show status messages in console
-
-  OptionCheckBox
-    id: showTimestampsInConsole
-    text: Show timestamps in console
-
-  OptionCheckBox
-    id: showLevelsInConsole
-    text: Show levels in console
-
-  OptionCheckBox
-    id: showPrivateMessagesInConsole
-    text: Show private messages in console
 
   Button
     text: Ok

modules/core_lib/core_lib.otmod

@@ -41,4 +41,5 @@ Module
     dofile 'widgets/uimessagebox'
     dofile 'widgets/uisplitter'
     dofile 'widgets/uiscrollbar'
+    dofile 'widgets/uiscrollarea'
 

modules/core_lib/globals.lua

@@ -4,7 +4,10 @@ importStyle = g_ui.importStyle
 importFont = g_fonts.importFont
 setDefaultFont = g_fonts.setDefaultFont
 
-loadUI = g_ui.loadUI
+function loadUI(otui, parent)
+  local otuiFilePath = resolvepath(otui, 2)
+  return g_ui.loadUI(otuiFilePath, parent)
+end
 
 function displayUI(otui, parent)
   parent = parent or rootWidget
@@ -17,7 +20,6 @@ function createWidget(stylename, parent)
     parent = rootWidget:recursiveGetChildById(parent)
   end
   local widget = g_ui.createWidgetFromStyle(stylename, parent)
-  --widget:setStyle(stylename)
   return widget
 end
 
@@ -36,6 +38,26 @@ function addEvent(callback, front)
   return event
 end
 
+
+function periodicalEvent(eventFunc, conditionFunc, delay, autoRepeatDelay)
+  delay = delay or 30
+  autoRepeatDelay = autoRepeatDelay or delay
+
+  local func
+  func = function()
+    if conditionFunc and not conditionFunc() then
+      func = nil
+      return
+    end
+    eventFunc()
+    scheduleEvent(func, delay)
+  end
+
+  scheduleEvent(function()
+    func()
+  end, autoRepeatDelay)
+end
+
 function removeEvent(event)
   if event then
     event:cancel()

modules/core_lib/mouse.lua

@@ -15,3 +15,24 @@ end
 function Mouse.restoreCursor()
   g_window.restoreMouseCursor()
 end
+
+function Mouse.bindAutoPress(widget, callback)
+  connect(widget, { onMousePress = function(widget, mousePos, mouseButton)
+    callback()
+    periodicalEvent(function()
+      callback()
+    end, function()
+      return widget:isPressed()
+    end, 30, 300)
+    return true
+  end })
+end
+
+function Mouse.bindPressMove(widget, callback)
+  connect(widget, { onMouseMove = function(widget, mousePos, mouseMoved)
+    if widget:isPressed() then
+      callback(mousePos, mouseMoved)
+    end
+    return true
+  end })
+end

modules/core_lib/widgets/uiscrollarea.lua

@@ -0,0 +1,15 @@
+UIScrollArea = extends(UIWidget)
+
+function UIScrollArea.create()
+  local scrollarea = UIScrollArea.internalCreate()
+  scrollarea:setClipping(true)
+  return scrollarea
+end
+
+function UIScrollArea:onStyleApply(styleName, styleNode)
+  for name,value in pairs(styleNode) do
+    if name == 'horizontal-scrollbar' then
+      
+    end
+  end
+end

modules/core_lib/widgets/uiscrollbar.lua

@@ -1,30 +1,157 @@
 UIScrollBar = extends(UIWidget)
 
+-- private functions
+local function calcValues(self)
+  local slider = self:getChildById('sliderButton')
+  local decrementButton = self:getChildById('decrementButton')
+  local incrementButton = self:getChildById('incrementButton')
+
+  local pxrange, center
+  if self.orientation == 'vertical' then
+    pxrange = (self:getHeight() - decrementButton:getHeight() - decrementButton:getMarginTop() - decrementButton:getMarginBottom()
+                                - incrementButton:getHeight() - incrementButton:getMarginTop() - incrementButton:getMarginBottom())
+    center = self:getY() + self:getHeight() / 2
+  else -- horizontal
+    pxrange = (self:getWidth() - decrementButton:getWidth() - decrementButton:getMarginLeft() - decrementButton:getMarginRight()
+                               - incrementButton:getWidth() - incrementButton:getMarginLeft() - incrementButton:getMarginRight())
+    center = self:getX() + self:getWidth() / 2
+  end
+
+  local range = self.maximum - self.minimum + 1
+  local proportion = math.max(range*(self.step/range), 1)/range
+  local px = math.max(math.floor(proportion * pxrange), 10)
+  local offset = ((self.value / (range - 1)) - 0.5) * (pxrange - px)
+
+  return range, pxrange, px, offset, center
+end
+
+local function updateSlider(self)
+  local slider = self:getChildById('sliderButton')
+  if slider == nil then return end
+
+  local range, pxrange, px, offset, center = calcValues(self)
+  if self.orientation == 'vertical' then
+    slider:setHeight(px)
+    slider:setMarginTop(offset)
+  else -- horizontal
+    slider:setWidth(px)
+    slider:setMarginLeft(offset)
+  end
+
+  if self.maximum == self.minimum then
+    self:disable()
+  else
+    self:enable()
+  end
+end
+
+local function parseSliderPos(self, pos)
+  local point
+  if self.orientation == 'vertical' then
+    point = pos.y
+  else
+    point = pos.x
+  end
+  local range, pxrange, px, offset, center = calcValues(self)
+  offset = math.min(math.max(point - center, -pxrange/2), pxrange/2)
+  local newvalue = math.floor(((offset / (pxrange - px)) + 0.5) * (range - 1))
+  self:setValue(newvalue)
+end
+
+
+-- public functions
 function UIScrollBar.create()
   local scrollbar = UIScrollBar.internalCreate()
   scrollbar:setFocusable(false)
+  scrollbar.value = 0
+  scrollbar.minimum = 0
+  scrollbar.maximum = 0
+  scrollbar.step = 1
+  scrollbar.orientation = 'vertical'
   return scrollbar
 end
 
 function UIScrollBar:onSetup()
-  --self.getChildById('upButton').onClick = function() self.navigateUp() end
+  addEvent(function()
-  --self.getChildById('upButton').onClick = function() self.navigateDown() end
+    Mouse.bindAutoPress(self:getChildById('decrementButton'), function() self:decrement() end)
-end
+    Mouse.bindAutoPress(self:getChildById('incrementButton'), function() self:increment() end)
-
+    Mouse.bindPressMove(self:getChildById('sliderButton'), function(mousePos, mouseMoved) parseSliderPos(self, mousePos) end)
-function UIScrollBar:attachWidget(widget)
+    updateSlider(self)
-  self.attachedWidget = widget
+  end)
 end
 
 function UIScrollBar:onStyleApply(styleName, styleNode)
-  if styleNode['attached-to'] then
+  for name,value in pairs(styleNode) do
-    local id = styleNode['attached-to']
+    if name == 'maximum' then
-    local parent = self:getParent()
+      self:setMaximum(tonumber(value))
-    local widget
+    elseif name == 'minimum' then
-    if id == 'parent' then
+      self:setMinimum(tonumber(value))
-      widget = parent
+    elseif name == 'step' then
-    elseif parent then
+      self:setStep(tonumber(value))
-      widget = parent:getChildById(id)
+    elseif name == 'orientation' then
+      self:setOrientation(value)
+    elseif name == 'value' then
+      self:setValue(value)
     end
-    self:attachWidget(widget)
   end
 end
+
+function UIScrollBar:decrement()
+  self:setValue(self.value - self.step)
+end
+
+function UIScrollBar:increment()
+  self:setValue(self.value + self.step)
+end
+
+function UIScrollBar:setMaximum(maximum)
+  if maximum == self.maximum then return end
+  self.maximum  = maximum
+  if self.value > maximum then
+    self:setValue(maximum)
+  else
+    updateSlider(self)
+  end
+end
+
+function UIScrollBar:setMinimum(minimum)
+  if minimum == self.minimum then return end
+  self.minimum = minimum
+  if self.value < minimum then
+    self:setValue(minimum)
+  else
+    updateSlider(self)
+  end
+end
+
+function UIScrollBar:setRange(minimum, maximum)
+  self:setMinimum(minimum)
+  self:setMaximum(maximum)
+end
+
+function UIScrollBar:setValue(value)
+  value = math.max(math.min(value, self.maximum), self.minimum)
+  if self.value == value then return end
+  local delta = value - self.value
+  self.value = value
+  updateSlider(self)
+  signalcall(self.onValueChange, self, value, delta)
+end
+
+function UIScrollBar:setStep(step)
+  self.step = step
+end
+
+function UIScrollBar:setOrientation(orientation)
+  self.orientation = orientation
+end
+
+function UIScrollBar:onGeometryChange()
+  updateSlider(self)
+end
+
+function UIScrollBar:getMaximum() return self.maximum end
+function UIScrollBar:getMinimum() return self.minimum end
+function UIScrollBar:getValue() return self.value end
+function UIScrollBar:getStep() return self.step end
+function UIScrollBar:getOrientation() return self.orientation end

modules/core_styles/styles/listboxes.otui

@@ -1,4 +1,4 @@
-TextList < UIWidget
+TextList < UIScrollArea
   layout: verticalBox
   border-width: 1
   border-color: #1d222b

modules/core_styles/styles/scrollbars.otui

@@ -1,30 +1,94 @@
+ScrollBarSlider < UIButton
+  id: sliderButton
+  anchors.centerIn: parent
+  size: 13 13
+  image-source: images/scrollbar.png
+  image-clip: 0 26 13 13
+  image-border: 2
+  image-color: #ffffffff
+  $hover:
+    image-clip: 13 26 13 13
+  $pressed:
+    image-clip: 26 26 13 13
+  $disabled:
+    image-color: #ffffff66
+
 VerticalScrollBar < UIScrollBar
+  orientation: vertical
   width: 13
-  image-source: images/vscrollbar.png
+  height: 39
-  image-clip: 0 39 13 32
+  image-source: images/scrollbar.png
+  image-clip: 39 0 13 65
   image-border: 1
 
   UIButton
-    id: upButton
+    id: decrementButton
     anchors.top: parent.top
-    anchors.right: parent.right
+    anchors.left: parent.left
-    image-source: images/vscrollbar.png
+    image-source: images/scrollbar.png
     image-clip: 0 0 13 13
+    image-color: #ffffffff
     size: 13 13
+    $hover:
+      image-clip: 13 0 13 13
+    $pressed:
+      image-clip: 26 0 13 13
+    $disabled:
+      image-color: #ffffff66
 
   UIButton
-    id: downButton
+    id: incrementButton
     anchors.bottom: parent.bottom
     anchors.right: parent.right
     size: 13 13
-    image-source: images/vscrollbar.png
+    image-source: images/scrollbar.png
     image-clip: 0 13 13 13
+    image-color: #ffffffff
+    $hover:
+      image-clip: 13 13 13 13
+    $pressed:
+      image-clip: 26 13 13 13
+    $disabled:
+      image-color: #ffffff66
 
-  //UIButton
+  ScrollBarSlider
-    //id: middleButton
+
-    //anchors.top: parent.top
+HorizontalScrollBar < UIScrollBar
-    //anchors.right: parent.right
+  orientation: horizontal
-    //size: 13 13
+  height: 13
-    //margin-top: 30
+  width: 39
-    //image-source: images/vscrollbar.png
+  image-source: images/scrollbar.png
-    //image-clip: 0 26 13 13
+  image-clip: 0 65 52 13
+  image-border: 1
+
+  UIButton
+    id: decrementButton
+    anchors.top: parent.top
+    anchors.left: parent.left
+    image-source: images/scrollbar.png
+    image-clip: 0 39 13 13
+    image-color: #ffffffff
+    size: 13 13
+    $hover:
+      image-clip: 13 39 13 13
+    $pressed:
+      image-clip: 26 39 13 13
+    $disabled:
+      image-color: #ffffff66
+
+  UIButton
+    id: incrementButton
+    anchors.bottom: parent.bottom
+    anchors.right: parent.right
+    size: 13 13
+    image-source: images/scrollbar.png
+    image-clip: 0 52 13 13
+    image-color: #ffffffff
+    $hover:
+      image-clip: 13 52 13 13
+    $pressed:
+      image-clip: 26 52 13 13
+    $disabled:
+      image-color: #ffffff66
+
+  ScrollBarSlider

modules/core_styles/styles/tabbars.otui

@@ -1,4 +1,5 @@
 TabBar < UITabBar
+  size: 80 20
 TabBarPanel < Panel
 TabBarButton < UIButton
   size: 20 20
@@ -9,7 +10,6 @@ TabBarButton < UIButton
   icon-color: white
   color: #aaaaaa
   anchors.top: parent.top
-  margin-left: 5
   padding: 5
 
   $first:
@@ -17,6 +17,7 @@ TabBarButton < UIButton
 
   $!first:
     anchors.left: prev.right
+    margin-left: 5
 
   $hover !checked:
     image-clip: 0 20 20 20

modules/game/widgets/uigamemap.lua

@@ -57,12 +57,9 @@ function UIGameMap:onDrop(widget, mousePos)
   return true
 end
 
-function UIGameMap:onMouseRelease(mousePosition, mouseButton)
+function UIGameMap:onClick(mousePosition)
   local tile = self:getTile(mousePosition)
   if tile == nil then return false end
-  if GameInterface.processMouseAction(mousePosition, mouseButton, nil, tile:getTopLookThing(), tile:getTopUseThing(), tile:getTopCreature(), tile:getTopMultiUseThing()) then
-    return true
-  elseif mouseButton == MouseLeftButton then
   local dirs = g_map.findPath(g_game.getLocalPlayer():getPosition(), tile:getPosition(), 255)
   if #dirs == 0 then
     TextMessage.displayStatus('There is no way.')
@@ -70,6 +67,13 @@ function UIGameMap:onMouseRelease(mousePosition, mouseButton)
   end
   g_game.autoWalk(dirs)
   return true
+end
+
+function UIGameMap:onMouseRelease(mousePosition, mouseButton)
+  local tile = self:getTile(mousePosition)
+  if tile == nil then return false end
+  if GameInterface.processMouseAction(mousePosition, mouseButton, nil, tile:getTopLookThing(), tile:getTopUseThing(), tile:getTopCreature(), tile:getTopMultiUseThing()) then
+    return true
   end
   return false
 end

src/framework/application.cpp

@@ -57,6 +57,7 @@ Application::Application(const std::string& appName)
     g_app = this;
     m_appName = appName;
     m_pollCycleDelay = POLL_CYCLE_DELAY;
+    m_frameSleep = 0;
 }
 
 Application::~Application()
@@ -200,6 +201,9 @@ void Application::run()
             // sleeps until next poll to avoid massive cpu usage
             g_clock.sleep(POLL_CYCLE_DELAY+1);
         }
+
+        if(m_frameSleep > 0)
+            g_clock.sleep(m_frameSleep);
     }
 
     m_stopping = false;

src/framework/application.h

@@ -43,10 +43,13 @@ public:
     virtual void poll();
     virtual void close();
 
+    void setFrameSleep(int delay) { m_frameSleep = delay; }
     void setPollCycleDelay(int delay) { m_pollCycleDelay = delay; }
 
     bool isRunning() { return m_running; }
     bool isStopping() { return m_stopping; }
+    int getFrameSleep() { return m_frameSleep; }
+    int getPollCycleDelay() { return m_pollCycleDelay; }
     const std::string& getName() { return m_appName; }
     const std::string& getVersion() { return m_appVersion; }
 
@@ -64,6 +67,7 @@ protected:
     std::string m_appVersion;
     std::string m_appBuildDate;
     int m_appFlags;
+    int m_frameSleep;
     int m_pollCycleDelay;
     Boolean<false> m_initialized;
     Boolean<false> m_running;

src/framework/luafunctions.cpp

@@ -104,8 +104,10 @@ void Application::registerLuaFunctions()
     g_lua.bindClassMemberFunction<UIWidget>("setPhantom", &UIWidget::setPhantom);
     g_lua.bindClassMemberFunction<UIWidget>("setDragable", &UIWidget::setDragable);
     g_lua.bindClassMemberFunction<UIWidget>("setFixedSize", &UIWidget::setFixedSize);
+    g_lua.bindClassMemberFunction<UIWidget>("setClipping", &UIWidget::setClipping);
     g_lua.bindClassMemberFunction<UIWidget>("setLastFocusReason", &UIWidget::setLastFocusReason);
     g_lua.bindClassMemberFunction<UIWidget>("setAutoRepeatDelay", &UIWidget::setAutoRepeatDelay);
+    g_lua.bindClassMemberFunction<UIWidget>("setVirtualOffset", &UIWidget::setVirtualOffset);
     g_lua.bindClassMemberFunction<UIWidget>("isVisible", &UIWidget::isVisible);
     g_lua.bindClassMemberFunction<UIWidget>("isChildLocked", &UIWidget::isChildLocked);
     g_lua.bindClassMemberFunction<UIWidget>("hasChild", &UIWidget::hasChild);
@@ -149,6 +151,7 @@ void Application::registerLuaFunctions()
     g_lua.bindClassMemberFunction<UIWidget>("isPhantom", &UIWidget::isPhantom);
     g_lua.bindClassMemberFunction<UIWidget>("isDragable", &UIWidget::isDragable);
     g_lua.bindClassMemberFunction<UIWidget>("isFixedSize", &UIWidget::isFixedSize);
+    g_lua.bindClassMemberFunction<UIWidget>("isClipping", &UIWidget::isClipping);
     g_lua.bindClassMemberFunction<UIWidget>("isDestroyed", &UIWidget::isDestroyed);
     g_lua.bindClassMemberFunction<UIWidget>("hasChildren", &UIWidget::hasChildren);
     g_lua.bindClassMemberFunction<UIWidget>("containsPoint", &UIWidget::containsPoint);
@@ -163,6 +166,7 @@ void Application::registerLuaFunctions()
     g_lua.bindClassMemberFunction<UIWidget>("getChildCount", &UIWidget::getChildCount);
     g_lua.bindClassMemberFunction<UIWidget>("getLastFocusReason", &UIWidget::getLastFocusReason);
     g_lua.bindClassMemberFunction<UIWidget>("getAutoRepeatDelay", &UIWidget::getAutoRepeatDelay);
+    g_lua.bindClassMemberFunction<UIWidget>("getVirtualOffset", &UIWidget::getVirtualOffset);
     g_lua.bindClassMemberFunction<UIWidget>("getStyleName", &UIWidget::getStyleName);
     g_lua.bindClassMemberFunction<UIWidget>("setX", &UIWidget::setX);
     g_lua.bindClassMemberFunction<UIWidget>("setY", &UIWidget::setY);
@@ -418,8 +422,12 @@ void Application::registerLuaFunctions()
     // Application
     g_lua.registerStaticClass("g_app");
     g_lua.bindClassStaticFunction("g_app", "exit", std::bind(&Application::exit, g_app));
+    g_lua.bindClassStaticFunction("g_app", "setFrameSleep", std::bind(&Application::setFrameSleep, g_app, _1));
+    g_lua.bindClassStaticFunction("g_app", "setPollCycleDelay", std::bind(&Application::setPollCycleDelay, g_app, _1));
     g_lua.bindClassStaticFunction("g_app", "isRunning", std::bind(&Application::isRunning, g_app));
     g_lua.bindClassStaticFunction("g_app", "isStopping", std::bind(&Application::isStopping, g_app));
+    g_lua.bindClassStaticFunction("g_app", "getFrameSleep", std::bind(&Application::getFrameSleep, g_app));
+    g_lua.bindClassStaticFunction("g_app", "getPollCycleDelay", std::bind(&Application::getPollCycleDelay, g_app));
     g_lua.bindClassStaticFunction("g_app", "getName", std::bind(&Application::getName, g_app));
     g_lua.bindClassStaticFunction("g_app", "getVersion", std::bind(&Application::getVersion, g_app));
     g_lua.bindClassStaticFunction("g_app", "getBuildCompiler", std::bind(&Application::getBuildCompiler, g_app));

src/framework/luascript/luaobject.h

@@ -40,6 +40,7 @@ public:
     template<typename R, typename... T>
     R callLuaField(const std::string& field, const T&... args);
 
+    /// Returns true if the lua field exists
     bool hasLuaField(const std::string& field);
 
     /// Sets a field in this lua object

src/framework/ui/uiwidget.cpp

@@ -53,20 +53,14 @@ UIWidget::~UIWidget()
 
 void UIWidget::draw(const Rect& visibleRect)
 {
-    drawSelf();
+    if(m_clipping)
-    if(m_children.size() > 0) {
-        bool clip = true;
-        if(this == g_ui.getRootWidget().get())
-            clip = false;
-
-        if(clip)
         g_graphics.beginClipping(visibleRect);
 
+    drawSelf();
     drawChildren(visibleRect);
 
-        if(clip)
+    if(m_clipping)
         g_graphics.endClipping();
-    }
 }
 
 void UIWidget::drawSelf()
@@ -1325,12 +1319,20 @@ bool UIWidget::onMouseWheel(const Point& mousePos, Fw::MouseWheelDirection direc
 
 bool UIWidget::onClick(const Point& mousePos)
 {
-    return callLuaField<bool>("onClick", mousePos);
+    if(hasLuaField("onClick")) {
+        callLuaField("onClick", mousePos);
+        return true;
+    }
+    return false;
 }
 
 bool UIWidget::onDoubleClick(const Point& mousePos)
 {
-    return callLuaField<bool>("onDoubleClick", mousePos);
+    if(hasLuaField("onDoubleClick")) {
+        callLuaField("onDoubleClick", mousePos);
+        return true;
+    }
+    return false;
 }
 
 bool UIWidget::propagateOnKeyText(const std::string& keyText)

src/framework/ui/uiwidget.h

@@ -41,6 +41,8 @@ struct EdgeGroup {
     T left;
 };
 
+// generate lua bindings for this class running:
+// ./tools/lua-binding-generator/generate_lua_bindings.lua src/framework/ui/uiwidget.h
 class UIWidget : public LuaObject
 {
 // widget core
@@ -65,6 +67,7 @@ protected:
     Boolean<false> m_phantom;
     Boolean<false> m_dragable;
     Boolean<false> m_destroyed;
+    Boolean<false> m_clipping;
     UILayoutPtr m_layout;
     UIWidgetWeakPtr m_parent;
     UIWidgetList m_children;
@@ -120,6 +123,7 @@ public:
     void setPhantom(bool phantom);
     void setDragable(bool dragable);
     void setFixedSize(bool fixed);
+    void setClipping(bool clipping) { m_clipping = clipping; }
     void setLastFocusReason(Fw::FocusReason reason);
     void setAutoRepeatDelay(int delay) { m_autoRepeatDelay = delay; }
     void setVirtualOffset(const Point& offset);
@@ -226,6 +230,7 @@ public:
     bool isPhantom() { return m_phantom; }
     bool isDragable() { return m_dragable; }
     bool isFixedSize() { return m_fixedSize; }
+    bool isClipping() { return m_clipping; }
     bool isDestroyed() { return m_destroyed; }
 
     bool hasChildren() { return m_children.size() > 0; }

src/framework/ui/uiwidgetbasestyle.cpp

@@ -120,6 +120,8 @@ void UIWidget::parseBaseStyle(const OTMLNodePtr& styleNode)
             setSize(node->value<Size>());
         else if(node->tag() == "fixed-size")
             setFixedSize(node->value<bool>());
+        else if(node->tag() == "clipping")
+            setClipping(node->value<bool>());
         else if(node->tag() == "border") {
             auto split = Fw::split(node->value(), " ");
             if(split.size() == 2) {