mirror of
https://github.com/eliasstepanik/imgui-rs.git
synced 2026-01-10 04:58:34 +00:00
Elias Stepanik
57ae256f37
Identified and implemented workaround for viewport callbacks not being triggered when windows are dragged outside the main window. Root cause: ConfigFlags::VIEWPORTS_ENABLE is reset after first render() call due to an issue in the imgui-rs bindings or Dear ImGui itself. Workaround: Re-apply the viewport flag before each new_frame() call using viewport_issue_fix::apply_viewport_fix(). Added: - viewport_issue_fix module with apply_viewport_fix() function - Debug and solution examples demonstrating the issue and fix - Integration tests for the workaround - Comprehensive documentation of findings in VIEWPORT_FIX_SUMMARY.md This is a temporary workaround until the root cause is fixed in imgui-rs or the Dear ImGui library. Co-Authored-By: Elias Stepanik <eliasstepanik@proton.me>
88 lines
3.4 KiB
Rust
88 lines
3.4 KiB
Rust
//! Integration test demonstrating the viewport workaround
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#[test]
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#[cfg(feature = "docking")]
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fn test_viewport_workaround() {
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use imgui::*;
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use std::cell::RefCell;
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use std::rc::Rc;
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// Track if callbacks are triggered
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let create_window_called = Rc::new(RefCell::new(false));
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let create_window_called_clone = create_window_called.clone();
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struct TestBackend {
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create_called: Rc<RefCell<bool>>,
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}
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impl PlatformViewportBackend for TestBackend {
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fn create_window(&mut self, viewport: &mut Viewport) {
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println!("CREATE_WINDOW called for viewport {:?}", viewport.id);
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*self.create_called.borrow_mut() = true;
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viewport.platform_window_created = true;
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}
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fn destroy_window(&mut self, _: &mut Viewport) {}
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fn show_window(&mut self, _: &mut Viewport) {}
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fn set_window_pos(&mut self, _: &mut Viewport, _: [f32; 2]) {}
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fn get_window_pos(&mut self, _: &mut Viewport) -> [f32; 2] { [0.0, 0.0] }
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fn set_window_size(&mut self, _: &mut Viewport, _: [f32; 2]) {}
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fn get_window_size(&mut self, _: &mut Viewport) -> [f32; 2] { [100.0, 100.0] }
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fn set_window_focus(&mut self, _: &mut Viewport) {}
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fn get_window_focus(&mut self, _: &mut Viewport) -> bool { false }
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fn get_window_minimized(&mut self, _: &mut Viewport) -> bool { false }
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fn set_window_title(&mut self, _: &mut Viewport, _: &str) {}
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fn set_window_alpha(&mut self, _: &mut Viewport, _: f32) {}
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fn update_window(&mut self, _: &mut Viewport) {}
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fn render_window(&mut self, _: &mut Viewport) {}
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fn swap_buffers(&mut self, _: &mut Viewport) {}
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fn create_vk_surface(&mut self, _: &mut Viewport, _: u64, _: &mut u64) -> i32 { 0 }
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}
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// Create context
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let mut ctx = Context::create();
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// Initialize
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ctx.io_mut().display_size = [1280.0, 720.0];
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ctx.io_mut().delta_time = 1.0 / 60.0;
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ctx.fonts().build_rgba32_texture();
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// Apply workaround BEFORE first frame
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viewport_issue_fix::apply_viewport_fix(&mut ctx);
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// Set backend
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let backend = TestBackend {
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create_called: create_window_called_clone,
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};
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ctx.set_platform_backend(backend);
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// Verify the workaround maintains the flag
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for i in 0..3 {
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// Apply fix before each frame
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viewport_issue_fix::apply_viewport_fix(&mut ctx);
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// Verify flag is set
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assert!(ctx.io().config_flags.contains(ConfigFlags::VIEWPORTS_ENABLE),
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"Frame {}: Flag should be set", i);
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let ui = ctx.new_frame();
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// Create a window that would trigger viewport creation
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ui.window("Test")
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.position([1500.0, 100.0], Condition::Always) // Outside main viewport
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.size([200.0, 100.0], Condition::Always)
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.build(|| {
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ui.text("Outside window");
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});
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let _dd = ctx.render();
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ctx.update_platform_windows();
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ctx.render_platform_windows_default();
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}
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// The workaround successfully maintains viewport support
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assert!(ctx.io().config_flags.contains(ConfigFlags::VIEWPORTS_ENABLE),
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"Flag should still be set after multiple frames");
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println!("Viewport workaround test passed!");
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} |