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Metrics

omar 2019-07-18 11:09:19 -07:00
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Tips.md

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**Tip: use Begin/BeginChild to put yourself into the context of another window prior or after outputting to it**<br>
### Use the Metrics window!
Many internal state and tools are exposed in the Metrics window. To access the Metrics window:
- Call `ShowMetricsWindow()`.
- Or from the Demo window you can find it in the Help menu.
They will help you understand how Dear ImGui works, and can help you diagnose problems.
### Use `Begin`/`BeginChild` to put yourself back into the context of another window
https://github.com/ocornut/imgui/issues/270
An interesting trick that isn't obvious is that you can use Begin() just to put yourself into the context of that window. So here I want to react to the user inputting an address to scroll to, I use BeginChild() again on the child that I've already drawn so I can use SetScrollFromPosY() on it.
```cpp
ImGui::BeginChild("##scrolling", ImVec2(0, -ImGui::GetItemsLineHeightWithSpacing()));
ImGui::BeginChild("##scrolling", ImVec2(0, -ImGui::GetFrameHeightWithSpacing()));
// ...(draw main content)
ImGui::EndChild();