allowed copying of 'minimized' image

src/app.rs

@@ -31,6 +31,7 @@ pub struct TerrainApp {
     params: GenerationParams,
     generation_tab: LeftTab,
     preview_focus: PreviewFocus,
+    hovered_preview: Option<PreviewFocus>,
     textures: Option<TexturePair>,
     generated: Option<GeneratedImages>,
     generation_receiver: Option<Receiver<Result<GeneratedImages, String>>>,
@@ -44,6 +45,7 @@ impl TerrainApp {
             params: GenerationParams::default(),
             generation_tab: LeftTab::Generation,
             preview_focus: PreviewFocus::Bumpmap,
+            hovered_preview: None,
             textures: None,
             generated: None,
             generation_receiver: None,
@@ -316,6 +318,9 @@ impl TerrainApp {
 
             let main_response =
                 render_clickable_image(ui, main_texture, Vec2::new(available.x, main_height), true);
+            if main_response.hovered() {
+                self.hovered_preview = Some(self.preview_focus);
+            }
             self.preview_context_menu(&main_response, self.preview_focus);
             self.overlay_copy_button(ui, main_response.rect, self.preview_focus);
             ui.add_space(8.0);
@@ -348,6 +353,9 @@ impl TerrainApp {
                             Vec2::new(thumb_width, bottom_strip_height - 32.0),
                             true,
                         );
+                        if secondary_response.hovered() {
+                            self.hovered_preview = Some(secondary_focus);
+                        }
                         self.preview_context_menu(&secondary_response, secondary_focus);
                         if secondary_response.clicked() {
                             self.preview_focus = secondary_focus;
@@ -361,6 +369,11 @@ impl TerrainApp {
 
 impl eframe::App for TerrainApp {
     fn update(&mut self, ctx: &Context, _frame: &mut eframe::Frame) {
+        self.hovered_preview = None;
+        self.poll_generation(ctx);
+        self.ui_left_panel(ctx);
+        self.ui_right_panel(ctx);
+
         let wants_keyboard_input = ctx.wants_keyboard_input();
         let should_copy = ctx.input(|input| {
             !wants_keyboard_input
@@ -377,11 +390,9 @@ impl eframe::App for TerrainApp {
         });
 
         if should_copy {
-            self.copy_preview(self.preview_focus);
+            let preview = self.hovered_preview.unwrap_or(self.preview_focus);
+            self.copy_preview(preview);
         }
-        self.poll_generation(ctx);
-        self.ui_left_panel(ctx);
-        self.ui_right_panel(ctx);
     }
 }