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Demo: Tree selection demo use !IsItemToggledOpen() (#1896) + update FAQ (#4366)

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ocornut 2021-10-25 18:31:16 +02:00
parent 99552420a2
commit 0f2898ea88
3 changed files with 10 additions and 6 deletions
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3
docs/FAQ.md
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@ -23,7 +23,7 @@ or view this file with any Markdown viewer.
| [I integrated Dear ImGui in my engine and some elements are clipping or disappearing when I move windows around...](#q-i-integrated-dear-imgui-in-my-engine-and-some-elements-are-clipping-or-disappearing-when-i-move-windows-around) | | [I integrated Dear ImGui in my engine and some elements are clipping or disappearing when I move windows around...](#q-i-integrated-dear-imgui-in-my-engine-and-some-elements-are-clipping-or-disappearing-when-i-move-windows-around) |
| [I integrated Dear ImGui in my engine and some elements are displaying outside their expected windows boundaries...](#q-i-integrated-dear-imgui-in-my-engine-and-some-elements-are-displaying-outside-their-expected-windows-boundaries) | | [I integrated Dear ImGui in my engine and some elements are displaying outside their expected windows boundaries...](#q-i-integrated-dear-imgui-in-my-engine-and-some-elements-are-displaying-outside-their-expected-windows-boundaries) |
| **Q&A: Usage** | | **Q&A: Usage** |
| **[About the ID Stack system..<br>Why is my widget not reacting when I click on it?<br>How can I have widgets with an empty label?<br>How can I have multiple widgets with the same label?](#q-about-the-id-stack-system)** | | **[About the ID Stack system..<br>Why is my widget not reacting when I click on it?<br>How can I have widgets with an empty label?<br>How can I have multiple widgets with the same label?]<br>How can I have multiple windows with the same label?](#q-about-the-id-stack-system)** |
| [How can I display an image? What is ImTextureID, how does it work?](#q-how-can-i-display-an-image-what-is-imtextureid-how-does-it-work)| | [How can I display an image? What is ImTextureID, how does it work?](#q-how-can-i-display-an-image-what-is-imtextureid-how-does-it-work)|
| [How can I use my own math types instead of ImVec2/ImVec4?](#q-how-can-i-use-my-own-math-types-instead-of-imvec2imvec4) | | [How can I use my own math types instead of ImVec2/ImVec4?](#q-how-can-i-use-my-own-math-types-instead-of-imvec2imvec4) |
| [How can I interact with standard C++ types (such as std::string and std::vector)?](#q-how-can-i-interact-with-standard-c-types-such-as-stdstring-and-stdvector) | | [How can I interact with standard C++ types (such as std::string and std::vector)?](#q-how-can-i-interact-with-standard-c-types-such-as-stdstring-and-stdvector) |
@ -190,6 +190,7 @@ Refer to rendering backends in the [examples/](https://github.com/ocornut/imgui/
### Q: Why is my widget not reacting when I click on it? ### Q: Why is my widget not reacting when I click on it?
### Q: How can I have widgets with an empty label? ### Q: How can I have widgets with an empty label?
### Q: How can I have multiple widgets with the same label? ### Q: How can I have multiple widgets with the same label?
### Q: How can I have multiple windows with the same label?
A primer on labels and the ID Stack... A primer on labels and the ID Stack...

8
imgui.cpp
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@ -723,9 +723,11 @@ CODE
Q&A: Usage Q&A: Usage
---------- ----------
Q: Why is my widget not reacting when I click on it? Q: About the ID Stack system..
Q: How can I have widgets with an empty label? - Why is my widget not reacting when I click on it?
Q: How can I have multiple widgets with the same label? - How can I have widgets with an empty label?
- How can I have multiple widgets with the same label?
- How can I have multiple windows with the same label?
Q: How can I display an image? What is ImTextureID, how does it works? Q: How can I display an image? What is ImTextureID, how does it works?
Q: How can I use my own math types instead of ImVec2/ImVec4? Q: How can I use my own math types instead of ImVec2/ImVec4?
Q: How can I interact with standard C++ types (such as std::string and std::vector)? Q: How can I interact with standard C++ types (such as std::string and std::vector)?

5
imgui_demo.cpp
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@ -786,6 +786,7 @@ static void ShowDemoWindowWidgets()
for (int i = 0; i < 6; i++) for (int i = 0; i < 6; i++)
{ {
// Disable the default "open on single-click behavior" + set Selected flag according to our selection. // Disable the default "open on single-click behavior" + set Selected flag according to our selection.
// To alter selection we use IsItemClicked() && !IsItemToggledOpen(), so clicking on an arrow doesn't alter selection.
ImGuiTreeNodeFlags node_flags = base_flags; ImGuiTreeNodeFlags node_flags = base_flags;
const bool is_selected = (selection_mask & (1 << i)) != 0; const bool is_selected = (selection_mask & (1 << i)) != 0;
if (is_selected) if (is_selected)
@ -794,7 +795,7 @@ static void ShowDemoWindowWidgets()
{ {
// Items 0..2 are Tree Node // Items 0..2 are Tree Node
bool node_open = ImGui::TreeNodeEx((void*)(intptr_t)i, node_flags, "Selectable Node %d", i); bool node_open = ImGui::TreeNodeEx((void*)(intptr_t)i, node_flags, "Selectable Node %d", i);
if (ImGui::IsItemClicked()) if (ImGui::IsItemClicked() && !ImGui::IsItemToggledOpen())
node_clicked = i; node_clicked = i;
if (test_drag_and_drop && ImGui::BeginDragDropSource()) if (test_drag_and_drop && ImGui::BeginDragDropSource())
{ {
@ -815,7 +816,7 @@ static void ShowDemoWindowWidgets()
// use BulletText() or advance the cursor by GetTreeNodeToLabelSpacing() and call Text(). // use BulletText() or advance the cursor by GetTreeNodeToLabelSpacing() and call Text().
node_flags |= ImGuiTreeNodeFlags_Leaf | ImGuiTreeNodeFlags_NoTreePushOnOpen; // ImGuiTreeNodeFlags_Bullet node_flags |= ImGuiTreeNodeFlags_Leaf | ImGuiTreeNodeFlags_NoTreePushOnOpen; // ImGuiTreeNodeFlags_Bullet
ImGui::TreeNodeEx((void*)(intptr_t)i, node_flags, "Selectable Leaf %d", i); ImGui::TreeNodeEx((void*)(intptr_t)i, node_flags, "Selectable Leaf %d", i);
if (ImGui::IsItemClicked()) if (ImGui::IsItemClicked() && !ImGui::IsItemToggledOpen())
node_clicked = i; node_clicked = i;
if (test_drag_and_drop && ImGui::BeginDragDropSource()) if (test_drag_and_drop && ImGui::BeginDragDropSource())
{ {