Download qt for ios

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The Qt Company exists to support both sets with the dual offering. If you want to migrate from open source Qt to a commercial license, you should contact us directly to discuss about your options in practice. Each application store has their own unique terms and conditions, which may or may not be compatible with distributing applications under LGPL or GPL licenses. The commercial license of Qt is compatible with the terms and conditions of all the leading application stores and thus typically the best choice for distributing a closed source application in various application stores.

Products distributed under the commercial version of Qt must also be developed under the commercial version of Qt. If you have already started the development with an open-source version of Qt and wish to move to a commercial license you need to have a written explicit permission from The Qt Company to facilitate this change.

The Qt Company reserves the right to grant the permission at its own discretion. If you are unsure of which license or version to use when you start development, we recommend you contact The Qt Company to advise you on the best choice based on your development needs.

Yes, it is possible to use both LGPLv2. Doing this does not require changing license in either of the libraries, and it is possible to select a proprietary license for the application, if desired. If LGPLv2. KDE is an international free software community, founded in , producing an integrated set of cross-platform applications for desktop and mainly known for its Plasma Desktop environment, which is provided as the default work environment on many Linux distributions.

KDE software is based on the Qt framework. In the early days of Qt, the KDE project and community was the biggest driving force in building the developer ecosystem around Qt.

In the very early days, Qt was already dual-licensed, but the source code was available under proprietary open source licenses. Compromises with KDE were sought to ensure that Qt would be available for their use under appropriate open source licensing even if Trolltech the company that founded Qt would be bought or go bankrupt.

The license agreement has been updated couple of times over the years, mainly because of acquisitions around Qt or updates to licenses and platforms. If software using these open source licensed libraries does not fully comply with the license obligations you will lose your license and related distribution rights.

It depends on how you license and distribute your product. You will need to fulfill the license obligations for these licenses when using Qt in your product. Both licenses have the same intention, namely to protect the freedom of users to use and modify the software licensed under LGPL. Get behind the wheel and own the streets from dusk til dawn.

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Google Chrome Free. However, specifying fonts in points and other sizes in pixels causes problems, because points are independent of the display density. A frame around a string that looks correct on low DPI displays is likely to become too small on high DPI displays, causing the text to be clipped. The level of high DPI support and the techniques used by the supported platforms varies from platform to platform. The following sections describe different approaches to scaling screen contents on high DPI displays.

In the traditional approach, the application is presented with an DPI value used to multiply font sizes, layouts, and so on. In the new approach, the operating system provides Qt with a scaling ratio that is used to scale graphics output: allocate larger buffers and set a scaling transform.

The advantage of this approach is that that vector graphics and fonts scale automatically and existing applications tend to work unmodified. For raster content, high-resolution alternative resources are needed, however. The OS scales window, event, and desktop geometry.

However, in OpenGL pixels are always device pixels. For example, geometry passed to glViewport needs to be scaled by devicePixelRatio.

The specified font sizes in points or pixels do not change and strings retain their relative size compared to the rest of the UI. Fonts are scaled as a part of painting, so that a size 12 font effectively becomes a size 24 font with 2x scaling, regardless of whether it is specified in points or in pixels.

The px unit is interpreted as device independent pixels to ensure that fonts do not appear smaller on a high DPI display. You can select one high DPI device as a reference device and calculate a scaling ratio for adjusting image and font sizes and margins to the actual screen size. For a reasonable scaling ratio, the height and width values must be set according to the default orientation of the reference device, which in this case is the portrait orientation.

The following code snippet sets the font scaling ratio to 1 if it would be less than one and thus cause the font sizes to become too small:. You should experiment with the target devices to find edge cases that require additional calculations. Some screens might just be too short or narrow to fit all the planned content and thus require their own layout.

For example, you might need to hide or replace some content on screens with atypical aspect ratios, such as The scaling ratio can be applied to all sizes in a QQmlPropertyMap to scale images, fonts, and margins:. The functions in the following code snippet apply the scaling ratio to fonts, images, and margins:. This technique gives you reasonable results when the screen sizes of the target devices do not differ too much. If the differences are huge, consider creating several different layouts with different reference values.

This enables you to load altenative resources depending on the platform on which the application is run. You can use file selectors together with singleton objects to access a single instance of an object on a particular platform. File selectors are static and enforce a file structure where platform-specific files are stored in subfolders named after the platform. If you need a more dynamic solution for loading parts of your UI on demand, you can use a Loader.

The target platforms might automate the loading of alternative resources for different display densities in various ways.

The QImage and QPixmap classes automatically set the devicePixelRatio of 2x versions of images to 2 , but you need to add code to actually use the 2x versions:.