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/****************************************************************************
**
** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the Qt Quick Controls module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** You may use this file under the terms of the BSD license as follows:
**
** "Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions are
** met:
** * Redistributions of source code must retain the above copyright
** notice, this list of conditions and the following disclaimer.
** * Redistributions in binary form must reproduce the above copyright
** notice, this list of conditions and the following disclaimer in
** the documentation and/or other materials provided with the
** distribution.
** * Neither the name of Digia Plc and its Subsidiary(-ies) nor the names
** of its contributors may be used to endorse or promote products derived
** from this software without specific prior written permission.
**
**
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
**
** $QT_END_LICENSE$
**
****************************************************************************/
import QtQuick 2.1
import QtQuick.Controls 1.0
import QtQuick.Controls.Private 1.0
/*!
\qmltype ComboBox
\inqmlmodule QtQuick.Controls 1.0
\since QtQuick.Controls 1.0
\ingroup controls
\brief Provides a drop-down list functionality.
Add items to the comboBox by assigning it a ListModel, or a list of strings to the \l model property.
\qml
ComboBox {
width: 200
model: [ "Banana", "Apple", "Coconut" ]
}
\endqml
Example 2:
\qml
ComboBox {
model: ListModel {
id: cbItems
ListElement { text: "Banana"; color: "Yellow" }
ListElement { text: "Apple"; color: "Green" }
ListElement { text: "Coconut"; color: "Brown" }
}
width: 200
onCurrentIndexChanged: console.debug(currentText + ", " + cbItems.get(currentIndex).color)
}
\endqml
You can create a custom appearance for a ComboBox by
assigning a \l ComboBoxStyle.
*/
Control {
id: comboBox
/*! \qmlproperty model ComboBox::model
The model to populate the ComboBox from. */
property alias model: popupItems.model
/*! The model role used for populating the ComboBox. */
property string textRole: ""
/*! \qmlproperty int ComboBox::currentIndex
The index of the currently selected item in the ComboBox. */
property alias currentIndex: popup.__selectedIndex
/*! \qmlproperty string ComboBox::currentText
The text of the currently selected item in the ComboBox. */
readonly property alias currentText: popup.selectedText
/*! This property specifies whether the combobox should gain active focus when pressed.
The default value is \c false. */
property bool activeFocusOnPress: false
/*! \qmlproperty bool ComboBox::pressed
This property holds whether the button is being pressed. */
readonly property bool pressed: mouseArea.pressed && mouseArea.containsMouse || popup.__popupVisible
/*! \qmlproperty bool ComboBox::hovered
This property indicates whether the control is being hovered.
*/
readonly property alias hovered: mouseArea.containsMouse
/*! \internal */
property var __popup: popup
style: Qt.createComponent(Settings.style + "/ComboBoxStyle.qml", comboBox)
activeFocusOnTab: true
Accessible.role: Accessible.ComboBox
MouseArea {
id: mouseArea
anchors.fill: parent
hoverEnabled: true
onPressed: {
if (comboBox.activeFocusOnPress)
forceActiveFocus()
popup.show()
}
}
Component.onCompleted: {
if (currentIndex === -1)
currentIndex = 0
popup.ready = true
popup.resolveTextValue(textRole)
}
onTextRoleChanged: popup.resolveTextValue(textRole)
Menu {
id: popup
objectName: "popup"
style: isPopup ? __style.__popupStyle : __style.__dropDownStyle
readonly property string selectedText: items[__selectedIndex] ? items[__selectedIndex].text : ""
property string textRole: ""
property bool ready: false
property bool isPopup: __panel ? __panel.popup : false
property int y: isPopup ? (comboBox.__panel.height - comboBox.__panel.implicitHeight) / 2.0 : comboBox.__panel.height
__minimumWidth: comboBox.width
__visualItem: comboBox
property ExclusiveGroup eg: ExclusiveGroup { id: eg }
property bool __modelIsArray: popupItems.model ? popupItems.model.constructor === Array : false
Instantiator {
id: popupItems
active: false
MenuItem {
text: popup.textRole === '' ?
modelData :
((popup.__modelIsArray ? modelData[popup.textRole] : model[popup.textRole]) || '')
checkable: true
exclusiveGroup: eg
}
onObjectAdded: popup.insertItem(index, object)
onObjectRemoved: popup.removeItem(object)
}
function resolveTextValue(initialTextRole) {
if (!ready || !model) {
popupItems.active = false
return;
}
var get = model['get'];
if (!get && popup.__modelIsArray) {
if (model[0].constructor !== String) // arrays of strings don't have textRole
get = function(i) { return model[i]; }
}
var modelMayHaveRoles = get !== undefined
textRole = initialTextRole
if (textRole === "" && modelMayHaveRoles && get(0)) {
// No text role set, check whether model has a suitable role
// If 'text' is found, or there's only one role, pick that.
var listElement = get(0)
var roleName = ""
var roleCount = 0
for (var role in listElement) {
if (role === "text") {
roleName = role
break
} else if (!roleName) {
roleName = role
}
++roleCount
}
if (roleCount > 1 && roleName !== "text") {
console.warn("No suitable 'textRole' found for ComboBox.")
} else {
textRole = roleName
}
}
popupItems.active = true
}
function show() {
if (items[__selectedIndex])
items[__selectedIndex].checked = true
__currentIndex = comboBox.currentIndex
__popup(0, y, isPopup ? __selectedIndex : 0)
}
}
// The key bindings below will only be in use when popup is
// not visible. Otherwise, native popup key handling will take place:
Keys.onSpacePressed: {
if (!popup.popupVisible)
popup.show()
}
Keys.onUpPressed: { if (currentIndex > 0) currentIndex-- }
Keys.onDownPressed: { if (currentIndex < popupItems.count - 1) currentIndex++ }
}
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