Qml window

ApplicationWindow is a Window which makes it convenient to add a menu barheader and footer item to the window. In this way you can control the window's properties, appearance and layout from QML. Even though this approach is fine for many applications and use cases, for a generic QML component it may not be acceptable as it creates a dependency to the surrounding environment.

ApplicationWindow provides a set of attached properties that can be used to access the window and its building blocks from places where no direct access to the window is available, without creating a dependency to a certain window id.

A QML component that uses the ApplicationWindow attached properties works in any window regardless of its id. This property holds the control that currently has active focus, or null if there is no control with active focus. The difference between Window::activeFocusItem and ApplicationWindow::activeFocusControl is that the former may point to a building block of a control, whereas the latter points to the enclosing control.

See also Window::activeFocusItem. The background item is stacked under the content itembut above the background color of the window. The background item is useful for images and gradients, for example, but the color property is preferable for solid colors, as it doesn't need to create an item.

Note: If the background item has no explicit size specified, it automatically follows the control's size. In most cases, there is no need to specify width or height for a background item. See also Customizing ApplicationWindowcontentItemheaderand footer. The data property allows you to freely mix visual children, resources and other windows in an ApplicationWindow. If you assign an Item to the contentData list, it becomes a child of the window's contentItemso that it appears inside the window.

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The item's parent will be the window's contentItem. It should not generally be necessary to refer to the contentData property, as it is the default property for ApplicationWindow and thus all child items are automatically assigned to this property.

See also contentItem. The content item is stacked above the background item, and under the menuBarheaderand footer items. See also backgroundmenuBarheaderand footer. The default font depends on the system environment. Finally, the font is matched against Qt's font database to find the best match. ApplicationWindow propagates explicit font properties to child controls. If you change a specific property on the window's font, that property propagates to all child controls in the window, overriding any system defaults for that property.

This property holds the window footer item. The footer item is positioned to the bottom, and resized to the width of the window. The default value is null. See also menuBarheaderand Page::footer. This property holds the window header item. The header item is positioned at the top of the window, below the menu bar, and resized to the width of the window. See also menuBarfooterand Page::header.

qml window

The default locale depends on the system environment. ApplicationWindow propagates the locale to child controls. If you change the window's locale, that locale propagates to all child controls in the window, overriding the system default locale. See also Control::locale and LayoutMirroring. This property holds the window menu bar. The menu bar is positioned at the top of the window, above the header, and resized to the width of the window.It also demonstrates how to package QML into resources and provide an icon to create a standalone QML desktop application.

To run the example from Qt Creatoropen the Welcome mode and select the example from Examples. For more information, visit Building and Running an Example. A splash screen can be created with the Qt. SplashScreen flag, and should be ApplicationModal to prevent interaction with the main window.

If the splash window is also transparent, and showing a partially transparent image, then it will look like a shaped window. In this example a Timer will automatically dismiss the splash screen, but in a real application you might want to connect to a signal from the application logic to hide the splash when initialization is complete.

The main window in this example is the control window, with some buttons and checkboxes to control and provide feedback on the state of a secondary window. Each checkbox has a binding to the property whose state it is displaying, and also an onClicked handler to change the state. This is the typical pattern to create a two-way binding while avoiding binding loops.

Screen has several properties which are generally useful to applications which need to rotate some content when the screen orientation changes, to position windows on the screen or to convert real units to logical pixel units. If a Window is nested inside an Item or another Window, the inner window becomes transient for the outer one see Window for more explanation.

But if you want to create multiple top-level windows as unrelated peers, you can create them inside a non-visual QtObject root item, as this example does. Example project code. Documentation contributions included herein are the copyrights of their respective owners. Qt and respective logos are trademarks of The Qt Company Ltd. All other trademarks are property of their respective owners.

Contents Running the Example Window Implementation. Window and Screen shows how to: create a window in QML control its visibility present a splash screen during application startup access the properties of the Screen It also demonstrates how to package QML into resources and provide an icon to create a standalone QML desktop application.

Window Implementation A splash screen can be created with the Qt. ApplicationModal flags : Qt.

QML Window Element

SplashScreen property int timeoutInterval : signal timeout.Provides a component that is normally the application's root component and handles transitions when the user rotates the screen. An application can be in the portrait or the landscape orientation. A user can physically rotate the device between these orientations, so you may want to layout the application's content differently depending on the screen's orientation.

When the user rotates the screen, Window sends various signals at different phases of the rotation. Window handles also the resizing of the screen and possible transitions when the orientation changes.

The Window component should not be used as a child item. From Nokia Belle Feature Pack 1 onwards, the included Qt Quick Components for Symbian will include a new Window implementation that enables orientation change animations.

Qt Quick Components version number will not be increased. To make your application future-proof, do not refer to the Window id when you anchor children to the Window - refer to the parent instead.

If the screen is in the portrait orientation, the value is true. If the screen is in the landscape orientation, the value is false.

If platformInverted is truethe component is visualized with the inverted style. By default platformInverted is false. Window:: orientationChangeAboutToStart. This signal is emitted when the screen orientation starts to change from one orientation to another. After this signal is emitted. Window:: orientationChangeFinished. This signal is emitted when the orientation change transition, for example screen transition animation, ends.

Window:: orientationChangeStarted. This signal is emitted when the orientation change transition, for example screen transition animation, starts. All other trademarks are property of their respective owners. Privacy Policy. Licensees holding valid Qt Commercial licenses may use this document in accordance with the Qt Commercial License Agreement provided with the Software or, alternatively, in accordance with the terms contained in a written agreement between you and Nokia.

A A A Print. Symbian: If platformInverted is truethe component is visualized with the inverted style. This property group was introduced in Qt Quick Components 1.

After this signal is emitted you can start to prepare your application for the new screen orientation. For example, you can stop all screen animations. Privacy Policy Licensees holding valid Qt Commercial licenses may use this document in accordance with the Qt Commercial License Agreement provided with the Software or, alternatively, in accordance with the terms contained in a written agreement between you and Nokia.At the touch of a button opens a second window, and the first closing.

And switch back the same way. Now we ask the same question, but with regard to QML. So, let's see how to implement it on the QML. Explanation of code begin with a secondary application window, since the transmission of information on the button is pressed to open the main application window is realized by a signal.

And it is more convenient to describe this moment in the beginning, before proceeding to the main application code. That is, the signal itself is declared and then comes its name. This same signal processor will be defined in the code as follows:. And in this file implemented the rest of the application logic. In the main window there are two buttons.

In the handler of each button, the corresponding secondary window and the main window is hidden. While the handler clicking each window occurs secondary closure of the window and opening the main application window.

The result will be implemented to switch between application windows has to QML, and thus you will always open only one application window.

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QML - Lesson 021. Switching between windows in QML

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qml window

Section subscription Money PayPal. Alex Nov. Alex Jan.The Window object creates a new top-level window for a Qt Quick scene. It automatically sets up the window for use with QtQuick 2. Omitting this import will allow you to have a QML environment without access to window system features.

A Window can be declared inside an Item or inside another Window; in that case the inner Window will automatically become "transient for" the outer Window: that is, most platforms will show it centered upon the outer window by default, and there may be other platform-dependent behaviors, depending also on the flags.

If the nested window is intended to be a dialog in your application, you should also set flags to Qt. Dialog, because some window managers will not provide the centering behavior without that flag.

qml window

You can also declare multiple windows inside a top-level QtObjectin which case the windows will have no transient relationship. Alternatively you can set or bind x and y to position the Window explicitly on the screen.

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When the user attempts to close a window, the closing signal will be emitted. You can force the window to stay open for example to prompt the user to save changes by writing an onClosing handler and setting close.

See also requestActivate. The item which currently has active focus or null if there is no item with active focus. This is a hint to the window manager in case it needs to display additional content like popups, dialogs, status bars, or similar in relation to the window.

The recommended orientation is Screen. The difference between the window and the content orientation determines how much to rotate the content by. The data property allows you to freely mix visual children, resources and other Windows in a Window.

If you assign another Window to the data list, the nested window will become "transient for" the outer Window. If you assign an Item to the data list, it becomes a child of the Window's contentItemso that it appears inside the window. The item's parent will be the window's contentItemwhich is the root of the Item ownership tree within that Window. It should not generally be necessary to refer to the data property, as it is the default property for Window and thus all child items are automatically assigned to this property.The Window object creates a new top-level window for a Qt Quick scene.

It automatically sets up the window for use with QtQuick 2. Omitting this import will allow you to have a QML environment without access to window system features. A Window can be declared inside an Item or inside another Window; in that case the inner Window will automatically become "transient for" the outer Window: that is, most platforms will show it centered upon the outer window by default, and there may be other platform-dependent behaviors, depending also on the flags.

If the nested window is intended to be a dialog in your application, you should also set flags to Qt. Dialog, because some window managers will not provide the centering behavior without that flag. You can also declare multiple windows inside a top-level QtObjectin which case the windows will have no transient relationship. Alternatively you can set or bind x and y to position the Window explicitly on the screen. When the user attempts to close a window, the closing signal will be emitted.

You can force the window to stay open for example to prompt the user to save changes by writing an onClosing handler and setting close. See also requestActivate. The item which currently has active focus or null if there is no item with active focus. This is a hint to the window manager in case it needs to display additional content like popups, dialogs, status bars, or similar in relation to the window. The recommended orientation is Screen.

The difference between the window and the content orientation determines how much to rotate the content by. The data property allows you to freely mix visual children, resources and other Windows in a Window. If you assign another Window to the data list, the nested window will become "transient for" the outer Window. If you assign an Item to the data list, it becomes a child of the Window's contentItemso that it appears inside the window. The item's parent will be the window's contentItemwhich is the root of the Item ownership tree within that Window.

It should not generally be necessary to refer to the data property, as it is the default property for Window and thus all child items are automatically assigned to this property. The window flags control the window's appearance in the windowing system, whether it's a dialog, popup, or a regular window, and whether it should have a title bar, etc.

The flags which you read from this property might differ from the ones that you set if the requested flags could not be fulfilled. The x,y position is relative to the Screen if there is only one, or to the virtual desktop arrangement of multiple screens.

qml window

A modal window prevents other windows from receiving input events. Possible values are Qt. NonModal the defaultQt.

WindowModal, and Qt. If the windowing system supports window opacity, this can be used to fade the window in and out, or to make it semitransparent. A value of 1. Values inbetween represent varying levels of translucency between the two extremes.This allows combining both QML and widgets in the same application, something that was not possible with Qt 5. The new method is well documented see References at the end of the posting but I did not see any complete compilable examples of using it, so I thought I would present one here.

The created window container will be a child of the parent widget and takes over ownership of the QWindow. Once the window has been embedded into the container, it will control the window's geometry and visibility. The main program, main.

In the implementation of the UI class in mainwindow. This returns a QWidget that we can add to the UI layout. I set the minimum and maximum size of the view widget and set the focus policy see the later discussion on focus handling. Shown below is the code with the relevant lines highlighted. I created a simple QML file which displays a red rectangle and some text.

To illustrate some things that are typically done in QML I added a rotation animation of text in the rectangle, which can be paused and resumed by clicking on it. The listing for the QML file is below. It will run as usual on its own using qmlscene if desired.

The complete source code for the example can be downloaded from here. This new feature of Qt 5. Introduction Qt 5.


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