The Qt Graphical Effects module is provided for compatibility with applications written for Qt 5. As far as practically feasible, effects have been ported, but some dynamically generated effects are incompatible with the approach to shader effects in Qt 6 and have thus been left out.
The Qt Graphical Effects module provides a set of QML types for adding visually impressive and configurable effects to user interfaces. Effects are visual items that can be added to Qt Quick user interface as UI components.
The API consists of over 15 effects provided as separate QML types. The effects cover functional areas such as masking, blurring, coloring, and many more.
要加载 Qt Graphical Effects，添加以下 import 语句到 .qml 文件：
import Qt5Compat.GraphicalEffects
To use the effects, simply add a specific effect declaration to the QML scene and configure the effects properties. Effects have one or more source properties for specifying the visual input for which the effect is applied to. The altered visual output is then presented in the effect item itself. The source can be another, often hidden, item in the QML scene. More complex effects can have multiple sources. The source item type can be any QML type, even video or another effect. Pipelining multiple effects together is a simple way to create even more impressive output.
Each effect has a set of properties that can be used to configure the effect output. Properties can be animated just like any other QML properties. The QML type documentation contains property descriptions and basic usage examples.
注意：
Effects are not available when running with the
software
backend of Qt Quick. For more information on Qt Quick scene graph backends, see
Scene Graph Adaptations
.
| BrightnessContrast | Adjusts brightness and contrast |
| ColorOverlay | Alters the colors of the source item by applying an overlay color |
| Colorize | Sets the color in the HSL color space |
| ConicalGradient | 绘制锥形渐变 |
| Desaturate | Reduces the saturation of the colors |
| Displace | Moves the pixels of the source item according to the given displacement map |
| DropShadow | Generates a colorized and blurred shadow image of the source and places it behind the original, giving the impression that source item is raised from the background |
| FastBlur | Applies a fast blur effect to one or more source items |
| GammaAdjust | Alters the luminance of the source item |
| Glow | Generates a blurred and colorized image of the source and places it behind the original, giving impression that the source is glowing |
| HueSaturation | Alters the source item colors in the HSL color space |
| LevelAdjust | Adjusts color levels in the RGBA color space |
| LinearGradient | 绘制线性渐变 |
| OpacityMask | Masks the source item with another item |
| RadialGradient | 绘制径向渐变 |
| RectangularGlow | Generates a blurred and colorized rectangle, which gives the impression that the source is glowing |
| ThresholdMask | Masks the source item with another item and applies a threshold value |
