Demo: added variety of usage scenarios, hooking Alt, Mouse Wheel, Home, CTRL+Tab demos.
(relate to issues: 456, 2637, 2620, 2891, 3370, 3724, 4828, 5108, 5242, 5641)
diff --git a/imgui_demo.cpp b/imgui_demo.cpp
index 965fbb4..0f36515 100644
--- a/imgui_demo.cpp
+++ b/imgui_demo.cpp
@@ -6471,6 +6471,249 @@
ImGui::Text("- IsKeyPressed(%s): %s", key_name, ImGui::IsKeyPressed(key, false) ? "PRESSED!" : "..");
ImGui::TreePop();
}
+
+ // Miscellaneous examples
+ if (ImGui::TreeNode("Usage Scenarios"))
+ {
+ // We use colored buttons for the demo but this would generally apply to any widget.
+ const ImVec2 button_sz(60.0f, 60.0f);
+ const ImGuiColorEditFlags button_flags = ImGuiColorEditFlags_NoTooltip | ImGuiColorEditFlags_NoDragDrop;
+
+ if (ImGui::TreeNode("1. Claiming Mouse Wheel"))
+ {
+ static float value1 = 0.0f;
+ ImGui::Text("%.2f", value1);
+ ImGui::SameLine();
+ HelpMarker("Hover button and use mouse wheel: window scrolling won't be activated.");
+ ImGui::ColorButton("Item1", ImVec4(0.4f, 0.4f, 0.8f, 1.0f), button_flags, button_sz);
+ ImGui::SetItemKeyOwner(ImGuiKey_MouseWheelY);
+ if (ImGui::IsItemHovered() || ImGui::IsItemActive())
+ value1 += io.MouseWheel;
+
+ static float value2 = 0.0f;
+ ImGui::Text("%.2f", value2);
+ ImGui::SameLine();
+ HelpMarker("Hold button and use mouse wheel: window scrolling won't be activated.");
+ ImGui::ColorButton("Item2", ImVec4(0.4f, 0.4f, 0.8f, 1.0f), button_flags, button_sz);
+ ImGui::SetItemKeyOwner(ImGuiKey_MouseWheelY, ImGuiInputFlags_CondActive);
+ if (ImGui::IsItemActive())
+ value2 += io.MouseWheel;
+
+ ImGui::TreePop();
+ }
+
+ if (ImGui::TreeNode("2. Claiming Alt key"))
+ {
+ ImGui::CheckboxFlags("io.ConfigFlags: NavEnableKeyboard", &io.ConfigFlags, ImGuiConfigFlags_NavEnableKeyboard);
+
+ static float spinner0 = 0.0f;
+ ImGui::Text("%.3f", spinner0);
+ ImGui::SameLine();
+ HelpMarker("Click, hold ALT drag to tweak value. Notice that Alt doesn't move focus to menu bar.");
+ ImGui::Button("Spin me", button_sz);
+ if (ImGui::IsItemActive())
+ {
+ //ImGui::SetKeyOwner(ImGuiMod_Alt, ImGui::GetItemID());
+ if (ImGui::IsKeyDown(ImGuiMod_Alt)) // Poll on Active: we don't need to check for ownership of ImGuiMod_Alt since we know we unconditionally own it.
+ spinner0 += io.MouseDelta.x;
+ }
+
+ // When using of keys is conditioned by item being hovered or active,
+ // it creates a natural exclusivity, since only one item can be hovered or active.
+ // SetItemKeyOwner(...) is a shortcut for doing 'if (IsItemHovered() || IsItemActive()) { SetKeyOwner(..., GetItemID()); }'
+ static int value1 = 0;
+ ImGui::Text("%d", value1);
+ ImGui::SameLine();
+ HelpMarker("Item1 claims ALT key when Hovered or Active, counter increase when pressing ALT while Hovered.");
+ ImGui::Button("Item1", button_sz);
+ ImGui::SetItemKeyOwner(ImGuiMod_Alt); // Claim Alt on Hover and Active
+ if (ImGui::IsItemHovered() && ImGui::IsKeyPressed(ImGuiMod_Alt, false)) // Poll on Hover: we don't need to check for ownership of ImGuiMod_Alt since we know we unconditionally own it.
+ value1++;
+
+ ImGui::TreePop();
+ }
+
+ // Routing options are only available for Shortcuts (not Key)
+ // Using shortcut functions with only ImGuiMod_Alt means that other modifiers e.g. CTRL+ALT+S won't be affected, which is often desirable.
+ // Here we use ImGuiInputFlags_RouteFocused which will claim the Alt shortcut when the window is focused.
+ // Notice that opening this node will claim Alt, therefore change the behavior of the key checks in section (2) above.
+ if (ImGui::TreeNode("3. Claiming Alt shortcut"))
+ {
+ // Using Shortcut() with ImGuiInputFlags_RouteFocused means we react when parent window is focused.
+ // - Passing 0 (== ImGuiKeyOwner_Any) means current loction will be used to identify.
+ // As both calls are from the same location, both items will receive the shortcut.
+ // - Passing GetItemID() here means they both have their unique id,
+ // - Item2 will only receive the shortcut when parent window is focused.
+ // - Item3 will only receive the shortcut when active.
+ // Not passing an item id would use current location as id so both items will always receive shortcut.
+ static bool use_shared_owner = false;
+ ImGui::Checkbox("Item2 and Item3 use same owner/location", &use_shared_owner);
+ static int value2 = 0;
+ ImGui::Text("%d", value2);
+ ImGui::SameLine();
+ HelpMarker("Item2 reads ALT shortcut when its parent window is focused.");
+ ImGui::Button("Item2", button_sz);
+ if (ImGui::Shortcut(ImGuiMod_Alt, 0, use_shared_owner ? 0 : ImGui::GetItemID()))
+ value2++;
+
+ static int value3 = 0;
+ ImGui::Text("%d", value3);
+ ImGui::SameLine();
+ HelpMarker("Item3 reads ALT shortcut when its parent window is focused AND it is active. Therefore, only active previous button will get the shortcut");
+ ImGui::Button("Item3", button_sz);
+ if (ImGui::Shortcut(ImGuiMod_Alt, 0, use_shared_owner ? 0 : ImGui::GetItemID()))
+ value3++;
+
+ ImGui::TreePop();
+ }
+
+ if (ImGui::TreeNode("4. Claiming Home key globally"))
+ {
+ static bool enable_home_robbery = false;
+ static int home_presses = 0;
+ ImGui::Checkbox("Global steal ImGuiKey_Home", &enable_home_robbery);
+ ImGui::Text("Home presses: %d", home_presses);
+ if (enable_home_robbery)
+ {
+ // Claim ownership is enough to keep Key away from main library behavior or any owner-aware code.
+ // - We optionally use the ImGuiInputFlags_LockUntilRelease to keep key away from code that is not owner-aware,
+ // but Dear ImGui itself is so that's not technically needed (unless you are stealing from another piece of code).
+ ImGuiID robber_id = ImGui::GetID("Some Identifier");
+ ImGui::SetKeyOwner(ImGuiKey_Home, robber_id, ImGuiInputFlags_LockUntilRelease);
+ if (ImGui::IsKeyPressed(ImGuiKey_Home, ImGuiInputFlags_Repeat, robber_id)) // We unconditionally own the key so no need to test for ownership
+ home_presses++;
+ }
+ ImGui::TreePop();
+ }
+
+ if (ImGui::TreeNode("5. Claiming CTRL+A shortcut globally"))
+ {
+ // Using a priority of ImGuiInputFlags_RouteGlobal + RouteOverActive means we takes away even from an active item (e.g. InputText)
+ // This is better covered in "Shortcut Routing basics" above.
+ static bool enable_ctrl_a_robbery = false;
+ static int ctrl_a_presses = 0;
+ ImGui::Checkbox("Global steal CTRL+A", &enable_ctrl_a_robbery);
+ ImGui::Text("CTRL+A presses: %d", ctrl_a_presses);
+ if (ImGui::Shortcut(ImGuiMod_Ctrl | ImGuiKey_A, enable_ctrl_a_robbery ? ImGuiInputFlags_RouteGlobal | ImGuiInputFlags_RouteOverActive : ImGuiInputFlags_RouteAlways))
+ ctrl_a_presses++;
+
+ ImGui::TreePop();
+ }
+
+ if (ImGui::TreeNode("6. Disable ESC key from InputText()"))
+ {
+ static char buf[9];
+ ImGui::InputText("Text", buf, IM_ARRAYSIZE(buf));
+
+ // - If you don't need to use the key, you can use 'owner_id=0', 'flags=ImGuiInputFlags_LockXXX'
+ // as a convenience to hide the key from everyone.
+ // - If you need to use the key yourself, you need to use any arbitrary ID, and then use this ID to read the key.
+ // e.g. ImGui::SetKeyOwner(ImGuiKey_Escape, ImGui::GetID("robber")); + later use same ID to access the key.
+ if (ImGui::IsItemActive())
+ ImGui::SetKeyOwner(ImGuiKey_Escape, 0, ImGuiInputFlags_LockUntilRelease);
+ ImGui::TreePop();
+ }
+
+ if (ImGui::TreeNode("7. Claiming ESC key away from InputText()"))
+ {
+ static char buf[9];
+ ImGui::InputText("Text", buf, IM_ARRAYSIZE(buf), ImGuiInputTextFlags_EscapeClearsAll);
+ if (ImGui::IsItemActive())
+ {
+ // Using a route which is higher priority than one claimed the ActiveId
+ ImGuiID robber_id = ImGui::GetID("robber");
+ if (ImGui::Shortcut(ImGuiKey_Escape, ImGuiInputFlags_RouteGlobal | ImGuiInputFlags_RouteOverActive, robber_id))
+ {
+ strcpy(buf, "Esc!");
+ ImGui::ClearActiveID();
+ }
+ }
+ ImGui::TreePop();
+ }
+
+ if (ImGui::TreeNode("8. Claiming ESC away from nav logic (e.g. exiting a child)"))
+ {
+ ImGui::BeginChild("child", ImVec2(-FLT_MIN, 50), true);
+ ImGui::Button("Button in child");
+ if (ImGui::IsWindowFocused())
+ ImGui::SetKeyOwner(ImGuiKey_Escape, ImGui::GetID("")); // any id
+ ImGui::EndChild();
+
+ ImGui::TreePop();
+ }
+
+ if (ImGui::TreeNode("9. Claiming Tab, CTRL+Tab"))
+ {
+ static int mode = 0;
+ static int counter = 0;
+
+ HelpMarker("Showcasing many variants as a recap.\nPlease read code and comments carefully!");
+
+ const char* mode_names[] = { "None", "Disable Tab key (item)", "Disable Tab key (global)", "Disable CTRL+Tab (global)", "Disable CTRL+Tab (if focused)", "Read CTRL+Tab (global)", "Replace CTRL+Tab (global)", "Replace CTRL+Tab (if focused)" };
+ ImGui::Combo("Operation Mode", &mode, mode_names, IM_ARRAYSIZE(mode_names));
+ ImGui::Text("Counter = %d", counter);
+
+ switch (mode)
+ {
+ case 1:
+ // Item take ownership of Tab key when hovered/active (meaning ALL uses of Tab will be disabled, not just CTRL+Tab)
+ ImGui::Button("This Button Steals The Tab Key");
+ ImGui::SetItemKeyOwner(ImGuiKey_Tab);
+ ImGui::SameLine();
+ HelpMarker("While hovering or activating this button, TAB key is stolen (e.g. won't tab out into other systems)");
+ break;
+ case 2:
+ // Take ownership of Tab key (meaning ALL uses of Tab will be disabled, not just CTRL+Tab)
+ ImGui::SetKeyOwner(ImGuiKey_Tab, ImGui::GetID("some-id"));
+ break;
+ case 3:
+ // Disable CTRL+Tab shortcuts (global): assign an owner to steal the route to our two shortcuts
+ ImGui::SetShortcutRouting(ImGuiMod_Ctrl | ImGuiKey_Tab, 0, ImGui::GetID("some-id"));
+ ImGui::SetShortcutRouting(ImGuiMod_Ctrl | ImGuiMod_Shift | ImGuiKey_Tab, 0, ImGui::GetID("some-id"));
+ break;
+ case 4:
+ // Disable CTRL+Tab shortcuts (if focused): assign an owner to steal the route to our two shortcuts, applies focus testing so will only apply if window is in focus chain
+ ImGui::SetShortcutRouting(ImGuiMod_Ctrl | ImGuiKey_Tab, ImGuiInputFlags_RouteFocused, ImGui::GetID("some-id"));
+ ImGui::SetShortcutRouting(ImGuiMod_Ctrl | ImGuiMod_Shift | ImGuiKey_Tab, ImGuiInputFlags_RouteFocused, ImGui::GetID("some-id"));
+ break;
+ case 5:
+ // Read CTRL+Tab (global): reading keys without interfering with any behaviors (need to specify ImGuiInputFlags_RouteAlways as other policies will interfere)
+ if (ImGui::Shortcut(ImGuiMod_Ctrl | ImGuiKey_Tab, ImGuiInputFlags_RouteAlways, ImGuiKeyOwner_Any))
+ counter++;
+ if (ImGui::Shortcut(ImGuiMod_Ctrl | ImGuiMod_Shift | ImGuiKey_Tab, ImGuiInputFlags_RouteAlways, ImGuiKeyOwner_Any))
+ counter--;
+ break;
+ case 6:
+ {
+ // Replace CTRL+Tab (global)
+ // - We steal the route and assign it to our ID (so core system won't access it). Our reading queries now need to specify that ID.
+ ImGuiID id = ImGui::GetID("My-Ctrl-Tab-Handler");
+ //ImGui::SetShortcutRouting(ImGuiMod_Ctrl | ImGuiKey_Tab, id, ImGuiInputFlags_RouteGlobal | ImGuiInputFlags_RouteOverActive);
+ //ImGui::SetShortcutRouting(ImGuiMod_Ctrl | ImGuiMod_Shift | ImGuiKey_Tab, id, ImGuiInputFlags_RouteGlobal | ImGuiInputFlags_RouteOverActive);
+ if (ImGui::Shortcut(ImGuiMod_Ctrl | ImGuiKey_Tab, ImGuiInputFlags_RouteGlobal | ImGuiInputFlags_RouteOverActive, id))
+ counter++; // You could perform some other action here.
+ if (ImGui::Shortcut(ImGuiMod_Ctrl | ImGuiMod_Shift | ImGuiKey_Tab, ImGuiInputFlags_RouteGlobal | ImGuiInputFlags_RouteOverActive, id))
+ counter--;
+ break;
+ }
+ case 7:
+ // Replace CTRL+Tab (if focused)
+ // - Passing ImGuiInputFlags_RouteFocused will test for focus and assign a route using a default owner id based on location (so we can use 0 as id)
+ // - This would also work if we replaced 0 with ImGui::GetID("My-Ctrl-Tab-Handler")
+ if (ImGui::Shortcut(ImGuiMod_Ctrl | ImGuiKey_Tab))
+ counter++; // You could perform some other action here.
+ if (ImGui::Shortcut(ImGuiMod_Ctrl | ImGuiMod_Shift | ImGuiKey_Tab))
+ counter--;
+ break;
+ }
+
+ static char buf[8] = "";
+ ImGui::InputTextWithHint("Dummy", "(dummy input text to test effect of Tabbing)", buf, IM_ARRAYSIZE(buf));
+
+ ImGui::TreePop();
+ }
+ ImGui::TreePop();
+ }
ImGui::TreePop();
}
