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Cross-widget text select (#3870)

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* Closes https://github.com/emilk/egui/issues/3816


![cross-widget-text-selection](https://github.com/emilk/egui/assets/1148717/5582b9d2-8b04-47b7-9637-f48e44064a70)

Turn off with `style.interaction.multi_widget_text_select`.

There is an API for this in `LabelSelectionState`, but it's pretty
bare-bones.

This became really hairy implementation-wise, but it works decently
well.

# Limitations
* Drag-select to scroll doesn't work
* A selection disappears if you scroll past one of its end-points
* Only the text of labels and links are selectable
 
## TODO
* [x] An option to turn it off
* [x] An API for querying about the selected text, and to deselect it.
* [x] Scrolling past selection behaves weird
* [x] Shift-click to select a range
This commit is contained in:
Emil Ernerfeldt
2024-01-24 15:45:22 +01:00
committed by GitHub
parent bcf032a08f
commit 41aad74552
19 changed files with 714 additions and 139 deletions
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2
crates/egui_demo_lib/src/demo/mod.rs
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@@ -19,6 +19,7 @@ pub mod misc_demo_window;
pub mod multi_touch;
pub mod paint_bezier;
pub mod painting;
pub mod panels;
pub mod password;
pub mod plot_demo;
pub mod scrolling;
@@ -31,7 +32,6 @@ pub mod text_layout;
pub mod toggle_switch;
pub mod widget_gallery;
pub mod window_options;
pub mod window_with_panels;
pub use {
about::About, demo_app_windows::DemoWindows, misc_demo_window::MiscDemoWindow,