Wt
3.7.1
|
A widget that provides a drop-down combo-box control. More...
#include <Wt/WComboBox>
Public Member Functions | |
WComboBox (WContainerWidget *parent=0) | |
Creates an empty combo-box with optional parent. | |
void | addItem (const WString &text) |
Adds an option item. More... | |
int | count () const |
Returns the number of items. | |
int | currentIndex () const |
Returns the currently selected item. More... | |
void | insertItem (int index, const WString &text) |
Inserts an item at the specified position. More... | |
void | removeItem (int index) |
Removes the item at the specified position. More... | |
void | setCurrentIndex (int index) |
Changes the current selection. More... | |
void | setItemText (int index, const WString &text) |
Changes the text for a specified option. More... | |
const WString | currentText () const |
Returns the text of the currently selected item. More... | |
const WString | itemText (int index) const |
Returns the text of a particular item. More... | |
void | setModel (WAbstractItemModel *model) |
Sets the model to be used for the items. More... | |
void | setModelColumn (int index) |
Sets the column in the model to be used for the items. More... | |
WAbstractItemModel * | model () const |
Returns the data model. More... | |
int | findText (const WString &text, WFlags< MatchFlag > flags=MatchExactly|MatchCaseSensitive) |
Returns the index of the first item that matches a text. | |
virtual SelectionMode | selectionMode () const |
Returns the selection mode. More... | |
virtual WString | valueText () const |
Returns the current value. More... | |
virtual void | setValueText (const WString &value) |
Sets the current value. More... | |
virtual void | refresh () |
Refresh the widget. More... | |
void | clear () |
Clears all items. More... | |
Signal< int > & | activated () |
Signal emitted when the selection changed. More... | |
Signal< WString > & | sactivated () |
Signal emitted when the selection changed. More... | |
void | setNoSelectionEnabled (bool enabled) |
Enables the ability to have 'no currently selected' item. More... | |
bool | noSelectionEnabled () const |
Returns whether 'no selection' is a valid state. More... | |
![]() | |
WFormWidget (WContainerWidget *parent=0) | |
Creates a WFormWidget with an optional parent. | |
~WFormWidget () | |
Destructor. More... | |
WLabel * | label () const |
Returns the label associated with this widget. More... | |
virtual void | setHidden (bool hidden, const WAnimation &animation=WAnimation()) |
Sets the hidden state of this widget. More... | |
void | setValidator (WValidator *validator) |
Sets a validator for this field. More... | |
virtual WValidator * | validator () const |
Returns the validator. | |
virtual WValidator::State | validate () |
Validates the field. More... | |
void | setEnabled (bool enabled) |
Sets whether the widget is enabled. More... | |
virtual void | setReadOnly (bool readOnly) |
Sets the element read-only. More... | |
bool | isReadOnly () const |
Returns whether the form element is read-only. More... | |
void | setEmptyText (const WString &emptyText) |
Sets the placeholder text (deprecated). More... | |
const WString & | emptyText () const |
Returns the placeholder text (deprecated). More... | |
virtual void | setPlaceholderText (const WString &placeholder) |
Sets the placeholder text. More... | |
const WString & | placeholderText () const |
Returns the placeholder text. More... | |
EventSignal & | changed () |
Signal emitted when the value was changed. More... | |
EventSignal & | selected () |
Signal emitted when ?? | |
Signal< WValidator::Result > & | validated () |
Signal emitted when the widget is being validated. More... | |
virtual void | setToolTip (const WString &text, TextFormat textFormat=PlainText) |
Sets a tooltip. More... | |
virtual bool | canReceiveFocus () const |
Returns whether the widget can receive focus. More... | |
virtual int | tabIndex () const |
Returns the tab index. More... | |
![]() | |
WInteractWidget (WContainerWidget *parent=0) | |
Create an InteractWidget with optional parent. | |
EventSignal< WKeyEvent > & | keyWentDown () |
Event signal emitted when a keyboard key is pushed down. More... | |
EventSignal< WKeyEvent > & | keyPressed () |
Event signal emitted when a "character" was entered. More... | |
EventSignal< WKeyEvent > & | keyWentUp () |
Event signal emitted when a keyboard key is released. More... | |
EventSignal & | enterPressed () |
Event signal emitted when enter was pressed. More... | |
EventSignal & | escapePressed () |
Event signal emitted when escape was pressed. More... | |
EventSignal< WMouseEvent > & | clicked () |
Event signal emitted when a mouse key was clicked on this widget. More... | |
EventSignal< WMouseEvent > & | doubleClicked () |
Event signal emitted when a mouse key was double clicked on this widget. More... | |
EventSignal< WMouseEvent > & | mouseWentDown () |
Event signal emitted when a mouse key was pushed down on this widget. More... | |
EventSignal< WMouseEvent > & | mouseWentUp () |
Event signal emitted when a mouse key was released on this widget. More... | |
EventSignal< WMouseEvent > & | mouseWentOut () |
Event signal emitted when the mouse went out of this widget. More... | |
EventSignal< WMouseEvent > & | mouseWentOver () |
Event signal emitted when the mouse entered this widget. More... | |
EventSignal< WMouseEvent > & | mouseMoved () |
Event signal emitted when the mouse moved over this widget. More... | |
EventSignal< WMouseEvent > & | mouseDragged () |
Event signal emitted when the mouse is dragged over this widget. More... | |
EventSignal< WMouseEvent > & | mouseWheel () |
Event signal emitted when the mouse scroll wheel was used. More... | |
EventSignal< WTouchEvent > & | touchStarted () |
Event signal emitted when a finger is placed on the screen. More... | |
EventSignal< WTouchEvent > & | touchEnded () |
Event signal emitted when a finger is removed from the screen. More... | |
EventSignal< WTouchEvent > & | touchMoved () |
Event signal emitted when a finger, which is already placed on the screen, is moved across the screen. More... | |
EventSignal< WGestureEvent > & | gestureStarted () |
Event signal emitted when a gesture is started. More... | |
EventSignal< WGestureEvent > & | gestureChanged () |
Event signal emitted when a gesture is changed. More... | |
EventSignal< WGestureEvent > & | gestureEnded () |
Event signal emitted when a gesture is ended. More... | |
void | setDraggable (const std::string &mimeType, WWidget *dragWidget=0, bool isDragWidgetOnly=false, WObject *sourceWidget=0) |
Configure dragging for drag and drop. More... | |
void | unsetDraggable () |
Disable drag & drop for this widget. More... | |
void | setMouseOverDelay (int delay) |
Sets a delay for the mouse over event. More... | |
int | mouseOverDelay () const |
Returns the mouse over signal delay. More... | |
virtual void | setPopup (bool popup) |
Lets the widget overlay over other sibling widgets. More... | |
virtual void | load () |
Loads content just before the widget is used. More... | |
virtual bool | isEnabled () const |
Returns whether the widget is enabled. More... | |
![]() | |
WWebWidget (WContainerWidget *parent=0) | |
Construct a WebWidget with a given parent. More... | |
virtual void | setPositionScheme (PositionScheme scheme) |
Sets the CSS position scheme. More... | |
virtual PositionScheme | positionScheme () const |
Returns the CSS position scheme. More... | |
virtual void | setOffsets (const WLength &offset, WFlags< Side > sides=All) |
Sets CSS offsets for a non-statically positioned widget. More... | |
virtual WLength | offset (Side s) const |
Returns a CSS offset. More... | |
virtual void | resize (const WLength &width, const WLength &height) |
Resizes the widget. More... | |
virtual WLength | width () const |
Returns the width. More... | |
virtual WLength | height () const |
Returns the height. More... | |
virtual void | setMinimumSize (const WLength &width, const WLength &height) |
Sets a minimum size. More... | |
virtual WLength | minimumWidth () const |
Returns the minimum width. More... | |
virtual WLength | minimumHeight () const |
Returns the minimum height. More... | |
virtual void | setMaximumSize (const WLength &width, const WLength &height) |
Sets a maximum size. More... | |
virtual WLength | maximumWidth () const |
Returns the maximum width. More... | |
virtual WLength | maximumHeight () const |
Returns the maximum height. More... | |
virtual void | setLineHeight (const WLength &height) |
Sets the CSS line height for contained text. | |
virtual WLength | lineHeight () const |
Returns the CSS line height for contained text. More... | |
virtual void | setFloatSide (Side s) |
Specifies a CSS float side. More... | |
virtual Side | floatSide () const |
Returns the CSS float side. More... | |
virtual void | setClearSides (WFlags< Side > sides) |
Sets the sides that should be cleared of floats. More... | |
virtual WFlags< Side > | clearSides () const |
Returns the sides that should remain empty. More... | |
virtual void | setMargin (const WLength &margin, WFlags< Side > sides=All) |
Sets CSS margins around the widget. More... | |
virtual WLength | margin (Side side) const |
Returns a CSS margin set. More... | |
virtual void | setHiddenKeepsGeometry (bool enabled) |
Sets whether the widget keeps its geometry when hidden. More... | |
virtual bool | hiddenKeepsGeometry () const |
Returns whether the widget keeps its geometry when hidden. More... | |
virtual bool | isHidden () const |
Returns whether the widget is set hidden. More... | |
virtual bool | isVisible () const |
Returns whether the widget is visible. More... | |
virtual void | setDisabled (bool disabled) |
Sets whether the widget is disabled. More... | |
virtual bool | isDisabled () const |
Returns whether the widget is set disabled. More... | |
virtual bool | isPopup () const |
Returns whether the widget is overlayed. More... | |
virtual void | setInline (bool isInline) |
Sets whether the widget is displayed inline or as a block. More... | |
virtual bool | isInline () const |
Returns whether the widget is displayed inline or as block. More... | |
virtual void | setDecorationStyle (const WCssDecorationStyle &style) |
Sets a CSS decoration style. More... | |
virtual WCssDecorationStyle & | decorationStyle () |
Returns the decoration style of this widget. More... | |
virtual void | setStyleClass (const WString &styleClass) |
Sets (one or more) CSS style classes. More... | |
virtual WString | styleClass () const |
Returns the CSS style class. More... | |
virtual void | addStyleClass (const WString &styleClass, bool force=false) |
Adds a CSS style class. More... | |
virtual void | removeStyleClass (const WString &styleClass, bool force=false) |
Removes a CSS style class. More... | |
virtual bool | hasStyleClass (const WString &styleClass) const |
Returns whether the widget has a style class. | |
virtual void | setVerticalAlignment (AlignmentFlag alignment, const WLength &length=WLength()) |
Sets the vertical alignment. More... | |
virtual AlignmentFlag | verticalAlignment () const |
Returns the vertical alignment. More... | |
virtual WLength | verticalAlignmentLength () const |
Returns the fixed vertical alignment that was set. More... | |
virtual void | setDeferredToolTip (bool enable, TextFormat textFormat=PlainText) |
Enable deferred tooltip. More... | |
virtual WString | toolTip () const |
Returns the tooltip. | |
virtual void | setAttributeValue (const std::string &name, const WString &value) |
Sets an attribute value. More... | |
virtual WString | attributeValue (const std::string &name) const |
Returns an attribute value. More... | |
virtual void | setJavaScriptMember (const std::string &name, const std::string &value) |
Sets a JavaScript member. More... | |
virtual std::string | javaScriptMember (const std::string &name) const |
Returns the value of a JavaScript member. More... | |
virtual void | callJavaScriptMember (const std::string &name, const std::string &args) |
Calls a JavaScript member. More... | |
virtual bool | loaded () const |
Returns whether this widget has been loaded. More... | |
virtual void | setId (const std::string &id) |
Sets the CSS Id. More... | |
virtual WWidget * | find (const std::string &name) |
Finds a descendent widget by name. More... | |
virtual WWidget * | findById (const std::string &id) |
Finds a descendent widget by id. | |
virtual void | setSelectable (bool selectable) |
Sets as selectable. More... | |
virtual void | doJavaScript (const std::string &javascript) |
Executes the given JavaScript statements when the widget is rendered or updated. More... | |
virtual const std::string | id () const |
Returns the (unique) identifier for this object. More... | |
void | setLoadLaterWhenInvisible (bool) |
Change the way the widget is loaded when invisible. More... | |
std::string | htmlTagName () const |
returns the current html tag name More... | |
void | setHtmlTagName (const std::string &tag) |
set the custom HTML tag name More... | |
const std::vector< WWidget * > & | children () const |
Returns contained widgets. More... | |
Signal & | childrenChanged () |
Signal emitted when children have been added or removed. More... | |
virtual void | setCanReceiveFocus (bool enabled) |
Sets whether the widget can receive focus. More... | |
virtual bool | setFirstFocus () |
Set focus on the widget's first descendant. More... | |
virtual void | setFocus (bool focus) |
Sets focus. More... | |
virtual bool | hasFocus () const |
Returns whether the widget currently has the focus. | |
virtual void | setTabIndex (int index) |
Sets the tab index. More... | |
EventSignal & | blurred () |
Signal emitted when the widget lost focus. More... | |
EventSignal & | focussed () |
Signal emitted when the widget recieved focus. More... | |
virtual bool | scrollVisibilityEnabled () const WT_CXX11ONLY(final override) |
Returns whether scroll visibility detection is enabled for this widget. More... | |
virtual void | setScrollVisibilityEnabled (bool enabled) WT_CXX11ONLY(final override) |
Sets whether scroll visibility detection is enabled for this widget. More... | |
virtual int | scrollVisibilityMargin () const WT_CXX11ONLY(final override) |
Returns the margin around the viewport within which the widget is considered visible. More... | |
virtual void | setScrollVisibilityMargin (int margin) WT_CXX11ONLY(final override) |
Sets the margin around the viewport within which the widget is considered visible. More... | |
virtual Signal< bool > & | scrollVisibilityChanged () WT_CXX11ONLY(final override) |
Signal triggered when the scroll visibility of this widget changes. More... | |
virtual bool | isScrollVisible () const WT_CXX11ONLY(final override) |
Returns whether this widget is currently considered scroll visible. More... | |
virtual void | setThemeStyleEnabled (bool enabled) |
Sets whether theme styling for a widget is enabled or disabled. More... | |
virtual bool | isThemeStyleEnabled () const |
Returns whether this widget is currently styled by the chosen theme. More... | |
![]() | |
virtual | ~WWidget () |
Destructor. More... | |
WWidget * | parent () const |
Returns the parent widget. More... | |
virtual void | removeChild (WObject *child) |
Removes a child object. More... | |
void | setWidth (const WLength &width) |
Sets the width. More... | |
void | setHeight (const WLength &height) |
Sets the height. More... | |
virtual void | positionAt (const WWidget *widget, Orientation orientation=Vertical) |
Positions a widget next to another widget. More... | |
virtual void | toggleStyleClass (const WString &styleClass, bool add, bool force=false) |
Toggles a CSS style class. | |
std::string | jsRef () const |
Returns a JavaScript expression to the corresponding DOM node. More... | |
void | setFocus () |
Sets focus. More... | |
virtual void | acceptDrops (const std::string &mimeType, const WString &hoverStyleClass=WString()) |
Sets a mime type to be accepted for dropping. More... | |
virtual void | stopAcceptDrops (const std::string &mimeType) |
Indicates that a mime type is no longer accepted for dropping. More... | |
virtual void | setObjectName (const std::string &name) |
Sets an object name. More... | |
virtual void | htmlText (std::ostream &out) |
Streams the (X)HTML representation. More... | |
bool | isRendered () const |
Returns whether the widget is rendered. More... | |
void | hide () |
Hides the widget. More... | |
void | animateHide (const WAnimation &animation) |
Hides the widget using an animation. More... | |
void | show () |
Shows the widget. More... | |
void | animateShow (const WAnimation &animation) |
Shows the widget using an animation. More... | |
void | enable () |
Enables the widget. More... | |
void | disable () |
Disable thes widget. More... | |
bool | layoutSizeAware () const |
Returns whether the widget is layout size aware. More... | |
![]() | |
WObject (WObject *parent=0) | |
Create a WObject with a given parent object. More... | |
virtual | ~WObject () |
Destructor. More... | |
virtual std::string | objectName () const |
Returns the object name. More... | |
void | resetLearnedSlots () |
Resets learned stateless slot implementations. More... | |
template<class T > | |
void | resetLearnedSlot (void(T::*method)()) |
Resets a learned stateless slot implementation. More... | |
template<class T > | |
WStatelessSlot * | implementStateless (void(T::*method)()) |
Declares a slot to be stateless and learn client-side behaviour on first invocation. More... | |
template<class T > | |
WStatelessSlot * | implementStateless (void(T::*method)(), void(T::*undoMethod)()) |
Declares a slot to be stateless and learn client-side behaviour in advance. More... | |
void | isNotStateless () |
Marks the current function as not stateless. More... | |
template<class T > | |
WStatelessSlot * | implementJavaScript (void(T::*method)(), const std::string &jsCode) |
Provides a JavaScript implementation for a method. More... | |
void | addChild (WObject *child) |
Adds a child object. More... | |
const std::vector< WObject * > & | children () const |
Returns the children. | |
WObject * | parent () const |
Returns the parent object. | |
Additional Inherited Members | |
![]() | |
typedef void(WObject::* | Method) () |
Typedef for a WObject method without arguments. | |
![]() | |
static WString | escapeText (const WString &text, bool newlinesToo=false) |
Escape HTML control characters in the text, to display literally (deprecated). More... | |
static std::string & | escapeText (std::string &text, bool newlinestoo=false) |
Escape HTML control characters in the text, to display literally (deprecated). More... | |
static bool | removeScript (WString &text) |
Remove tags/attributes from text that are not passive (deprecated). More... | |
static std::string | jsStringLiteral (const std::string &v, char delimiter='\'') |
Turn a UTF8 encoded string into a JavaScript string literal. More... | |
![]() | |
static WString | tr (const char *key) |
Short hand for WString::tr() More... | |
![]() | |
virtual void | enableAjax () |
Progresses to an Ajax-enabled widget. More... | |
virtual void | render (WFlags< RenderFlag > flags) |
Renders the widget. More... | |
virtual void | propagateSetEnabled (bool enabled) |
Propagates that a widget was enabled or disabled through children. More... | |
![]() | |
virtual WStatelessSlot * | getStateless (Method method) |
On-demand stateless slot implementation. More... | |
![]() | |
void | setLayoutSizeAware (bool sizeAware) |
Sets the widget to be aware of its size set by a layout manager. More... | |
virtual void | layoutSizeChanged (int width, int height) |
Virtual method that indicates a size change. More... | |
WWidget (WContainerWidget *parent=0) | |
Creates a widget. More... | |
virtual void | dropEvent (WDropEvent dropEvent) |
Handles a drop event. More... | |
virtual int | boxPadding (Orientation orientation) const |
Returns the widget's built-in padding. More... | |
virtual int | boxBorder (Orientation orientation) const |
Returns the widget's built-in border width. More... | |
void | scheduleRender (WFlags< RepaintFlag > flags=0) |
Schedules rerendering of the widget. More... | |
![]() | |
static WObject * | sender () |
Returns the sender of the current slot call. More... | |
A widget that provides a drop-down combo-box control.
A combo box provides the user with a set of options, from which one option may be selected.
WComboBox is an MVC view class, using a simple string list model by default. The model may be populated using addItem(const WString&) or insertItem(int, const WString&) and the contents can be cleared through clear(). These methods manipulate the underlying model().
To use the combo box with a custom model instead of the default WStringListModel, use setModel().
To react to selection events, connect to the changed(), activated() or sactivated() signals.
At all times, the current selection index is available through currentIndex() and the current selection text using currentText().
WComboBox does not have support for auto-completion, this behaviour can be found in the WSuggestionPopup.
Usage example:
WComboBox is an inline widget.
The widget corresponds to the HTML <select>
tag and does not provide styling. It can be styled using inline or external CSS as appropriate.
Signal<int>& Wt::WComboBox::activated | ( | ) |
Signal emitted when the selection changed.
The newly selected item is passed as an argument.
void Wt::WComboBox::addItem | ( | const WString & | text | ) |
Adds an option item.
Equivalent to insertItem (count(), text
).
void Wt::WComboBox::clear | ( | ) |
Clears all items.
Removes all items from the underlying model. This requires that the model() is editable.
int Wt::WComboBox::currentIndex | ( | ) | const |
Returns the currently selected item.
If no item is currently selected, the method returns -1.
By default, for a combo box, the first item is selected, and thus currentIndex() = 0, while for a selection box no item is selected.
const WString Wt::WComboBox::currentText | ( | ) | const |
Returns the text of the currently selected item.
void Wt::WComboBox::insertItem | ( | int | index, |
const WString & | text | ||
) |
Inserts an item at the specified position.
The item is inserted in the underlying model at position index
. This requires that the model() is editable.
const WString Wt::WComboBox::itemText | ( | int | index | ) | const |
Returns the text of a particular item.
WAbstractItemModel* Wt::WComboBox::model | ( | ) | const |
Returns the data model.
bool Wt::WComboBox::noSelectionEnabled | ( | ) | const |
Returns whether 'no selection' is a valid state.
|
virtual |
Refresh the widget.
The refresh method is invoked when the locale is changed using WApplication::setLocale() or when the user hit the refresh button.
The widget must actualize its contents in response.
Reimplemented from Wt::WFormWidget.
void Wt::WComboBox::removeItem | ( | int | index | ) |
Removes the item at the specified position.
The item is removed from the underlying model. This requires that the model() is editable.
Signal emitted when the selection changed.
The newly selected text is passed as an argument.
|
virtual |
Returns the selection mode.
Always returns SingleSelection for a combo box, but may return ExtendedSelection for a selection box
Reimplemented in Wt::WSelectionBox.
void Wt::WComboBox::setCurrentIndex | ( | int | index | ) |
Changes the current selection.
Specify a value of -1 for index
to clear the selection.
void Wt::WComboBox::setItemText | ( | int | index, |
const WString & | text | ||
) |
Changes the text for a specified option.
The text for the item at position index
is changed. This requires that the model() is editable.
void Wt::WComboBox::setModel | ( | WAbstractItemModel * | model | ) |
Sets the model to be used for the items.
The model
may not be 0, and ownership of the model is not transferred.
The default value is a WStringListModel that is owned by the combo box. Items in the model can be grouped by setting the LevelRole. The contents is interpreted by Wt::asString, and subsequent items of the same group are rendered as children of a HTML <optgroup>
element.
void Wt::WComboBox::setModelColumn | ( | int | index | ) |
Sets the column in the model to be used for the items.
The column index
in the model will be used to retrieve data.
The default value is 0.
void Wt::WComboBox::setNoSelectionEnabled | ( | bool | enabled | ) |
Enables the ability to have 'no currently selected' item.
The setting may only be changed for a combo box (and not for a selection box). When enabled, the currentIndex() may be '-1' also when the combo box contains values. The user can however not select this option, it is thus only useful as a default value.
By default, no selection is false
for a combo-box and true
for a selection box.
|
virtual |
Sets the current value.
Sets the current index to the item corresponding to value
.
Implements Wt::WFormWidget.
|
virtual |