Flickable (and ScrollView): Add a property to prevent delaying press events #9521
Description
Currently, the Flickable and anything using it will delay forwarding the press event to their children by 100ms to avoid a "flicking" effect of the pressed state when scrolling.
We should add a property on the Flickable to disable this delay.
Original Bug Description
TouchArea.pressed property is working laggy. It can detect click events correctly with quick touchs, but in order to make pressed flag true, I have to touch and wait longer.
It should work instantly when I first touched the screen and button color should change.
Here is the GIF from video:
Here is the Desktop version, works properly and the button background color changes everytime I press the mouse down:
Reproducible Code (if applicable)
// Custom Button Component
export component Button inherits Rectangle {
in property <bool> active: false;
in property <image> icon <=> img.source;
in property <string> text <=> label.text;
out property <bool> pressed: touch.pressed;
in property <bool> opaque: true;
callback clicked;
preferred-width: label.width + 27px;
preferred-height: label.height + 5px;
touch := TouchArea {
clicked => {
root.clicked()
}
}
property <color> background-color: active ? Palette.primary-accent-color.brighter(0.10) : Palette.button-color;
background: opaque ? (pressed ? background-color.darker(0.30) : background-color) : (pressed ? background-color.transparentize(0.85) : background-color.transparentize(0.65));
label := Text {
vertical-alignment: center;
horizontal-alignment: center;
color: active ? Palette.primary-accent-text-color : Palette.text-color;
font-size: Palette.font-size;
}
img := Image {
colorize: Palette.text-color;
}
}
// Used the button in another file like this:
property <int> count;
Button {
text: "Clicked: " + count;
height: 200px;
clicked => {
count = count + 1;
}
}Environment Details
- Slint Version: 1.13.1
- Platform/OS: Android 15
- Programming Language: Rust + Slint
- Backend/Renderer: Skia + Vulkan
Product Impact
I am building an Android app with Slint.
This UI Feels laggy and inresponsive and it is bad for user experience.