Back in April we wrote about image-based styling for Qt Quick Controls 2. Since then, we have made good progress and nailed down some aspects that were still under consideration. We call the new style "Imagine".
The style works by scanning a directory of images and applying those images to the controls. For example, when a Button is created, the style will look for button-background.9.png (or button-background.png for non-resizable buttons). As an example of what that image could look like, here's button-background.9.png from the default assets:
When the user presses the button, the style then looks for button-background-pressed.9.png (or button-background-pressed.png). In the case of the default assets, that would look like this:
The .9.png extension represents 9-Patch images. Using this format, we're able to encode information about how the control should look when it is resized into the image itself. Combine this with the pre-defined file naming convention and you've got a style that can be customized without ever touching QML, giving designers complete control over what they do best, and allowing developers to focus on writing applications, not styles.
To provide a starting point for creating your own style, we've created a complete asset template in Sketch:
For those who prefer Illustrator or Photoshop, we've provided smaller templates, each with their own example that uses the assets:
The Imagine style is available with Qt 5.10. For more information, see the documentation.
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