Tab Order

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Introduction

This code provides Tab and Shift+Tab navigation through a list of widgets.

Create an instance of TabNavigation for each group of tab order, such as one per dialog. Specify the parent via a call to setParent(). This will help catch Tab and Shift+Tab keys, which will then properly cycle through the widgets specified via addWidget(). Note that addWidget() accepts window names as well as the handle of TabControl; this will automatically add the TabButton of that TabControl.

Please discuss this snippet within the Tab Order thread.

Files

TabNavigation.h

<cpp/>

  1. ifndef _TabNavigation_h_
  2. define _TabNavigation_h_
  1. include <vector>
  2. include "CEGUI.h"

class TabNavigation { public: /* Specifies the parent or container. Used to trap Tab and Shift+Tab keys and relay them to the list of tab navigation. */ void setParent(const CEGUI::String& window);

/* Adds a TabControl widget. Its tab buttons will be added to the list of tab navigation. */ void addWidget(const CEGUI::TabControl* tabControl);

/* Adds a widget to the list of tab navigation. The order in which they are added corresponds to the tab order. */ void addWidget(const CEGUI::String& window);

private: /* Ensures that the last known focused widget regains input. */ bool _onParentActivated(const CEGUI::EventArgs& e);

/* Handles non-tab key activation. This will ensure that the next tab key navigation will start from the relevant widget. */ bool _onActivated(const CEGUI::EventArgs& e);

/* Traps the Tab and Shift+Tab key and activates the next or previous widget accordingly. */ bool _onCharacterKey(const CEGUI::EventArgs& e);

/* Maintains the list of widgets that participate in the tab order */ std::vector<CEGUI::String> _tabNavigation;

/* Maintains the last known widget to have the focus. */ std::vector<CEGUI::String>::iterator _lastKnownFocus; };

  1. endif // _TabNavigation_h_

TabNavigation.cpp

<cpp/>

  1. include "TabNavigation.h"


/* These provide a visual focus cue when the scheme does not provide one 

*	 for every widget, such as TaharezLook's PushButton */
  1. define HACKED_FOCUS_GAIN(window) CEGUI::WindowManager::getSingleton().getWindow(window)->setAlpha(1.0f)
  2. define HACKED_FOCUS_LOSS(window) CEGUI::WindowManager::getSingleton().getWindow(window)->setAlpha(0.8f)

/* You can deactivate these hacked focus functions by defining the macro as a comment:

  1. define HACKED_FOCUS_GAIN(window) //
  2. define HACKED_FOCUS_LOSS(window) //
*/


void TabNavigation::setParent(const CEGUI::String& window) { // Parent will feed the tab and shift+tab navigation to the list of monitored widgets CEGUI::WindowManager& wmgr = CEGUI::WindowManager::getSingleton(); wmgr.getWindow(window)->subscribeEvent(CEGUI::Window::EventCharacterKey, CEGUI::Event::Subscriber(&TabNavigation::_onCharacterKey, this)); wmgr.getWindow(window)->subscribeEvent(CEGUI::Window::EventActivated, CEGUI::Event::Subscriber(&TabNavigation::_onParentActivated, this)); }

void TabNavigation::addWidget(const CEGUI::String& window) { // Add a widget to the list of widget navigation CEGUI::WindowManager& wmgr = CEGUI::WindowManager::getSingleton();

wmgr.getWindow(window)->subscribeEvent(CEGUI::Window::EventCharacterKey, CEGUI::Event::Subscriber(&TabNavigation::_onCharacterKey, this)); wmgr.getWindow(window)->subscribeEvent(CEGUI::Window::EventActivated, CEGUI::Event::Subscriber(&TabNavigation::_onActivated, this)); HACKED_FOCUS_LOSS(window); if(!_tabNavigation.size()) { wmgr.getWindow(window)->activate(); // Activate the first widget by default HACKED_FOCUS_GAIN(window); } _tabNavigation.push_back(window); _lastKnownFocus = _tabNavigation.begin(); // Reset the iterator after each modification to the vector }

void TabNavigation::addWidget(const CEGUI::TabControl* tabControl) { // Add every tab buttons of a tab control CEGUI::WindowManager& wmgr = CEGUI::WindowManager::getSingleton(); CEGUI::Window* tabPaneButtons = wmgr.getWindow(tabControl->getName() + "__auto_TabPane__Buttons"); for(size_t idx = 0; idx < tabPaneButtons->getChildCount(); idx++) { addWidget(tabPaneButtons->getChildAtIdx(idx)->getName()); } }

bool TabNavigation::_onParentActivated(const CEGUI::EventArgs& e) { // Parent is being activated, activate the widget with the last known focus if(_tabNavigation.size() && _lastKnownFocus != _tabNavigation.end()) { CEGUI::WindowManager& wmgr = CEGUI::WindowManager::getSingleton(); CEGUI::Window* window = wmgr.getWindow(*_lastKnownFocus); if(window) window->activate(); } return true; }

bool TabNavigation::_onActivated(const CEGUI::EventArgs& e) { // A focus widget has been activated without tabbing (could be a mouse click) CEGUI::String currentlyFocused = static_cast<const CEGUI::WindowEventArgs&>(e).window->getName(); if(_tabNavigation.size() && (_lastKnownFocus == _tabNavigation.end() || (*_lastKnownFocus).compare(currentlyFocused)) ) { if(_lastKnownFocus != _tabNavigation.end()) { // These curly braces are IMPORTANT!!! HACKED_FOCUS_LOSS(*_lastKnownFocus); } for(_lastKnownFocus = _tabNavigation.begin(); _lastKnownFocus != _tabNavigation.end(); _lastKnownFocus++) { if(!(*_lastKnownFocus).compare(currentlyFocused)) { HACKED_FOCUS_GAIN(currentlyFocused); return true; } } // Can't figure out who has the focus _lastKnownFocus = _tabNavigation.begin(); HACKED_FOCUS_GAIN(*_lastKnownFocus); } return true; }

bool TabNavigation::_onCharacterKey(const CEGUI::EventArgs& e) { // Handle Tab (next) and Shift+Tab (previous) widget navigation assert(_tabNavigation.size() && "Don't simply call setParent(), also call addWidget()"); if(static_cast<const CEGUI::KeyEventArgs&>(e).codepoint == 9) // Tab or Shift+Tab { // Identify who currently has the focus CEGUI::WindowManager& wmgr = CEGUI::WindowManager::getSingleton(); std::vector<CEGUI::String>::iterator itFocus, itCurrent; if(_lastKnownFocus != _tabNavigation.end() && wmgr.getWindow(*_lastKnownFocus)->isActive()) { // The last known focus is still in focus itCurrent = _lastKnownFocus; } else { // Figure out who (if anyone) has the focus for(itCurrent = _tabNavigation.begin(); itCurrent != _tabNavigation.end(); itCurrent++) { if(wmgr.getWindow(*itCurrent)->isActive()) { // Found who has the focus break; } } if(itCurrent == _tabNavigation.end()) { // We did not find who had the focus // Someone not in our list of monitored widgets has STOLEN the focus! // Use the last known focus or, if that's invalid, the first widget itCurrent = _lastKnownFocus != _tabNavigation.end() ? _lastKnownFocus : _tabNavigation.begin(); } }

// Change the focus itFocus = itCurrent; // The search starts from the currently focused CEGUI::Window* newWidget = 0; do { if(static_cast<const CEGUI::KeyEventArgs&>(e).sysKeys & CEGUI::Shift) { // Search previous if(itFocus == _tabNavigation.begin()) itFocus = --_tabNavigation.end(); else itFocus--; } else { // Search next itFocus++; if(itFocus == _tabNavigation.end()) itFocus = _tabNavigation.begin(); } newWidget = wmgr.getWindow(*itFocus); if(newWidget->isVisible() && !newWidget->isDisabled()) { // We have found a valid focus target _lastKnownFocus = itFocus; break; } newWidget = 0; } while(itFocus != itCurrent); // Iterate while we're on a different widget

if(newWidget) { // Remove the focus from this widget HACKED_FOCUS_LOSS(*itCurrent);

// Give the focus to this widget newWidget->activate(); HACKED_FOCUS_GAIN(newWidget->getName()); return true; } } return false; }

TabNavigation_demo.h

<cpp/>

  1. ifndef _WidgetFocus_Demo_h_
  2. define _WidgetFocus_Demo_h_
  1. include "CEGuiSample.h"
  2. include "CEGUI.h"
  3. include "TabNavigation.h"

class DemoSample : public CEGuiSample { public: 

   bool initialiseSample()

{ using namespace CEGUI; try { // Retrieve the window manager WindowManager& winMgr = WindowManager::getSingleton();

// Load the TaharezLook scheme and set up the default mouse cursor and font SchemeManager::getSingleton().loadScheme("TaharezLook.scheme"); System::getSingleton().setDefaultMouseCursor("TaharezLook", "MouseArrow"); if(!FontManager::getSingleton().isFontPresent("Commonwealth-10")) FontManager::getSingleton().createFont("Commonwealth-10.font");

// Set the GUI Sheet Window* sheet = winMgr.createWindow("DefaultWindow", "root_wnd"); System::getSingleton().setGUISheet(sheet);

// Load a layout Window* guiLayout = winMgr.loadWindowLayout("TabNavigation.layout"); sheet->addChildWindow(guiLayout);


/* TabNavigation-specific code */ navMainWindow.setParent("TabOrder/MainWindow"); navMainWindow.addWidget("TabOrder/MainWindow/Field_1"); navMainWindow.addWidget("TabOrder/MainWindow/Field_2"); navMainWindow.addWidget("TabOrder/MainWindow/Field_3");

navSecondaryWindow.setParent("TabOrder/SecondaryWindow"); navSecondaryWindow.addWidget("TabOrder/SecondaryWindow/Field_1"); navSecondaryWindow.addWidget("TabOrder/SecondaryWindow/Field_2"); navSecondaryWindow.addWidget("TabOrder/SecondaryWindow/Field_3"); } catch(Exception &e) { #if defined( __WIN32__ ) || defined( _WIN32 ) MessageBox(NULL, e.getMessage().c_str(), "Error initializing the demo", MB_OK | MB_ICONERROR | MB_TASKMODAL); #else std::cerr << "Error initializing the demo:" << e.getMessage().c_str() << "\n"; #endif }

return true; } 

   void cleanupSample(void)

{ } private: TabNavigation navMainWindow; TabNavigation navSecondaryWindow; };


  1. endif // _WidgetFocus_Demo_h_

TabNavigation.layout

<?xml version="1.0" encoding="UTF-8"?>

<GUILayout >
    <Window Type="DefaultWindow" Name="TabOrder" >
        <Property Name="InheritsAlpha" Value="False" />
        <Property Name="UnifiedMaxSize" Value="{{1,0},{1,0}}" />
        <Property Name="UnifiedAreaRect" Value="{{0,0},{0,0},{1,0},{1,0}}" />
        <Window Type="TaharezLook/FrameWindow" Name="TabOrder/MainWindow" >
            <Property Name="Text" Value="Main Window" />
            <Property Name="TitlebarFont" Value="Commonwealth-10" />
            <Property Name="UnifiedMaxSize" Value="{{1,0},{1,0}}" />
            <Property Name="TitlebarEnabled" Value="True" />
            <Property Name="UnifiedAreaRect" Value="{{0.0296875,0},{0.0583334,0},{0.43125,0},{0.468749,0}}" />
            <Window Type="TaharezLook/Editbox" Name="TabOrder/MainWindow/Field_1" >
                <Property Name="Text" Value="Field 1" />
                <Property Name="MaxTextLength" Value="1073741823" />
                <Property Name="UnifiedMaxSize" Value="{{1,0},{1,0}}" />
                <Property Name="UnifiedAreaRect" Value="{{0.0719849,0},{0.19543,0},{0.905642,0},{0.354059,0}}" />
            </Window>
            <Window Type="TaharezLook/Button" Name="TabOrder/MainWindow/Field_2" >
                <Property Name="Text" Value="Field 2" />
                <Property Name="UnifiedMaxSize" Value="{{1,0},{1,0}}" />
                <Property Name="UnifiedAreaRect" Value="{{0.071985,0},{0.413199,0},{0.905642,0},{0.663199,0}}" />
            </Window>
            <Window Type="TaharezLook/Spinner" Name="TabOrder/MainWindow/Field_3" >
                <Property Name="StepSize" Value="1" />
                <Property Name="CurrentValue" Value="0" />
                <Property Name="MaximumValue" Value="32767" />
                <Property Name="MinimumValue" Value="-32768" />
                <Property Name="UnifiedMaxSize" Value="{{1,0},{1,0}}" />
                <Property Name="UnifiedAreaRect" Value="{{0.071985,0},{0.711169,0},{0.905642,0},{0.961169,0}}" />
            </Window>
        </Window>
        <Window Type="TaharezLook/FrameWindow" Name="TabOrder/SecondaryWindow" >
            <Property Name="Font" Value="Commonwealth-10" />
            <Property Name="Text" Value="Secondary Window" />
            <Property Name="TitlebarFont" Value="Commonwealth-10" />
            <Property Name="UnifiedMaxSize" Value="{{1,0},{1,0}}" />
            <Property Name="TitlebarEnabled" Value="True" />
            <Property Name="UnifiedAreaRect" Value="{{0.454688,0},{0.0583334,0},{0.856251,0},{0.468749,0}}" />
            <Window Type="TaharezLook/Editbox" Name="TabOrder/SecondaryWindow/Field_1" >
                <Property Name="Font" Value="Commonwealth-10" />
                <Property Name="Text" Value="Field 1" />
                <Property Name="MaxTextLength" Value="1073741823" />
                <Property Name="UnifiedMaxSize" Value="{{1,0},{1,0}}" />
                <Property Name="UnifiedAreaRect" Value="{{0.071985,0},{0.19543,0},{0.905642,0},{0.354059,0}}" />
            </Window>
            <Window Type="TaharezLook/Button" Name="TabOrder/SecondaryWindow/Field_2" >
                <Property Name="Font" Value="Commonwealth-10" />
                <Property Name="Text" Value="Field 2" />
                <Property Name="UnifiedMaxSize" Value="{{1,0},{1,0}}" />
                <Property Name="UnifiedAreaRect" Value="{{0.071985,0},{0.413199,0},{0.905642,0},{0.663199,0}}" />
            </Window>
            <Window Type="TaharezLook/Spinner" Name="TabOrder/SecondaryWindow/Field_3" >
                <Property Name="Font" Value="Commonwealth-10" />
                <Property Name="StepSize" Value="1" />
                <Property Name="CurrentValue" Value="0" />
                <Property Name="MaximumValue" Value="32767" />
                <Property Name="MinimumValue" Value="-32768" />
                <Property Name="UnifiedMaxSize" Value="{{1,0},{1,0}}" />
                <Property Name="UnifiedAreaRect" Value="{{0.071985,0},{0.711169,0},{0.905642,0},{0.961169,0}}" />
            </Window>
        </Window>
    </Window>
</GUILayout>
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