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Nav: working on early bits of documentation (#323)
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ocornut
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imgui.cpp
174
imgui.cpp
@ -51,22 +51,21 @@
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Designed for developers and content-creators, not the typical end-user! Some of the weaknesses includes:
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- doesn't look fancy, doesn't animate
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- limited layout features, intricate layouts are typically crafted in code
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- occasionally uses statically sized buffers for string manipulations - won't crash, but some very long pieces of text may be clipped. functions like ImGui::TextUnformatted() don't have such restriction.
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END-USER GUIDE
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==============
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- double-click title bar to collapse window
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- click upper right corner to close a window, available when 'bool* p_open' is passed to ImGui::Begin()
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- click and drag on lower right corner to resize window
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- click and drag on any empty space to move window
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- double-click/double-tap on lower right corner grip to auto-fit to content
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- Double-click title bar to collapse window
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- Click upper right corner to close a window, available when 'bool* p_open' is passed to ImGui::Begin()
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- Click and drag on lower right corner to resize window
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- Click and drag on any empty space to move window
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- Double-click/double-tap on lower right corner grip to auto-fit to content
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- TAB/SHIFT+TAB to cycle through keyboard editable fields
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- use mouse wheel to scroll
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- use CTRL+mouse wheel to zoom window contents (if IO.FontAllowScaling is true)
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- Use mouse wheel to scroll
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- Use CTRL+mouse wheel to zoom window contents (if io.FontAllowScaling is true)
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- CTRL+Click on a slider or drag box to input value as text
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- text editor:
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- Text editor:
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- Hold SHIFT or use mouse to select text.
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- CTRL+Left/Right to word jump
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- CTRL+Shift+Left/Right to select words
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@ -75,75 +74,109 @@
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- CTRL+Z,CTRL+Y to undo/redo
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- ESCAPE to revert text to its original value
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- You can apply arithmetic operators +,*,/ on numerical values. Use +- to subtract (because - would set a negative value!)
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- Controls are automatically adjusted for OSX to match standard OSX text editing operations.
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- Gamepad/keyboard navigation are in beta-phase, see Programmer Guide below.
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PROGRAMMER GUIDE
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================
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- read the FAQ below this section!
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- your code creates the UI, if your code doesn't run the UI is gone! == very dynamic UI, no construction/destructions steps, less data retention on your side, no state duplication, less sync, less bugs.
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- call and read ImGui::ShowTestWindow() for demo code demonstrating most features.
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- see examples/ folder for standalone sample applications. Prefer reading examples/opengl_example/ first as it is the simplest.
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you may be able to grab and copy a ready made imgui_impl_*** file from the examples/.
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- customization: PushStyleColor()/PushStyleVar() or the style editor to tweak the look of the interface (e.g. if you want a more compact UI or a different color scheme).
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READ FIRST
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- getting started:
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- init: call ImGui::GetIO() to retrieve the ImGuiIO structure and fill the fields marked 'Settings'.
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- init: call io.Fonts->GetTexDataAsRGBA32(...) and load the font texture pixels into graphics memory.
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- every frame:
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1/ in your mainloop or right after you got your keyboard/mouse info, call ImGui::GetIO() and fill the fields marked 'Input'
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2/ call ImGui::NewFrame() as early as you can!
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3/ use any ImGui function you want between NewFrame() and Render()
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4/ call ImGui::Render() as late as you can to end the frame and finalize render data. it will call your RenderDrawListFn handler that you set in the IO structure.
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(if you don't need to render, you still need to call Render() and ignore the callback, or call EndFrame() instead. if you call neither some aspects of windows focusing/moving will appear broken.)
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- all rendering information are stored into command-lists until ImGui::Render() is called.
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- ImGui never touches or know about your GPU state. the only function that knows about GPU is the RenderDrawListFn handler that you provide.
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- effectively it means you can create widgets at any time in your code, regardless of considerations of being in "update" vs "render" phases of your own application.
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- refer to the examples applications in the examples/ folder for instruction on how to setup your code.
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- a typical application skeleton may be:
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- Read the FAQ below this section!
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- Your code creates the UI, if your code doesn't run the UI is gone! == very dynamic UI, no construction/destructions steps, less data retention on your side, no state duplication, less sync, less bugs.
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- Call and read ImGui::ShowTestWindow() for demo code demonstrating most features.
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- Customization: PushStyleColor()/PushStyleVar() or the style editor to tweak the look of the interface (e.g. if you want a more compact UI or a different color scheme).
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// Application init
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ImGuiIO& io = ImGui::GetIO();
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io.DisplaySize.x = 1920.0f;
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io.DisplaySize.y = 1280.0f;
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io.IniFilename = "imgui.ini";
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io.RenderDrawListsFn = my_render_function; // Setup a render function, or set to NULL and call GetDrawData() after Render() to access the render data.
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// TODO: Fill others settings of the io structure
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GETTING STARTED WITH INTEGRATING IN YOUR ENGINE
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// Load texture atlas
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// There is a default font so you don't need to care about choosing a font yet
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unsigned char* pixels;
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int width, height;
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io.Fonts->GetTexDataAsRGBA32(pixels, &width, &height);
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// TODO: At this points you've got a texture pointed to by 'pixels' and you need to upload that your your graphic system
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// TODO: Store your texture pointer/identifier (whatever your engine uses) in 'io.Fonts->TexID'
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- See examples/ folder for standalone sample applications. Prefer reading examples/opengl_example/ first as it is the simplest.
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You may be able to grab and copy a ready made imgui_impl_*** file from the examples/.
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- Init: call ImGui::GetIO() to retrieve the ImGuiIO structure and fill the fields marked 'Settings'.
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- Init: call io.Fonts->GetTexDataAsRGBA32(...) and load the font texture pixels into graphics memory.
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- Every frame:
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1/ in your mainloop or right after you got your keyboard/mouse info, call ImGui::GetIO() and fill the fields marked 'Input'
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2/ call ImGui::NewFrame() as early as you can!
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3/ use any ImGui function you want between NewFrame() and Render()
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4/ call ImGui::Render() as late as you can to end the frame and finalize render data. it will call your RenderDrawListFn handler that you set in the IO structure.
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(if you don't need to render, you still need to call Render() and ignore the callback, or call EndFrame() instead. if you call neither some aspects of windows focusing/moving will appear broken.)
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- All rendering information are stored into command-lists until ImGui::Render() is called.
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- ImGui never touches or know about your GPU state. the only function that knows about GPU is the RenderDrawListFn handler that you provide.
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- Effectively it means you can create widgets at any time in your code, regardless of considerations of being in "update" vs "render" phases of your own application.
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- Refer to the examples applications in the examples/ folder for instruction on how to setup your code.
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- A typical application skeleton may be:
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// Application main loop
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while (true)
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{
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// 1) get low-level inputs (e.g. on Win32, GetKeyboardState(), or poll your events, etc.)
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// TODO: fill all fields of IO structure and call NewFrame
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ImGuiIO& io = ImGui::GetIO();
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io.DeltaTime = 1.0f/60.0f;
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io.MousePos = mouse_pos;
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io.MouseDown[0] = mouse_button_0;
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io.MouseDown[1] = mouse_button_1;
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io.KeysDown[i] = ...
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// Application init
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ImGuiIO& io = ImGui::GetIO();
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io.DisplaySize.x = 1920.0f;
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io.DisplaySize.y = 1280.0f;
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io.IniFilename = "imgui.ini";
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io.RenderDrawListsFn = my_render_function; // Setup a render function, or set to NULL and call GetDrawData() after Render() to access the render data.
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// TODO: Fill others settings of the io structure
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// 2) call NewFrame(), after this point you can use ImGui::* functions anytime
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ImGui::NewFrame();
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// Load texture atlas (there is a default font so you don't need to care about choosing a font yet)
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unsigned char* pixels;
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int width, height;
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io.Fonts->GetTexDataAsRGBA32(pixels, &width, &height);
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// TODO: At this points you've got a texture pointed to by 'pixels' and you need to upload that your your graphic system
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// TODO: Store your texture pointer/identifier (whatever your engine uses) in 'io.Fonts->TexID'
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// 3) most of your application code here
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MyGameUpdate(); // may use any ImGui functions, e.g. ImGui::Begin("My window"); ImGui::Text("Hello, world!"); ImGui::End();
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MyGameRender(); // may use any ImGui functions
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// Application main loop
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while (true)
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{
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// 1) get low-level inputs (e.g. on Win32, GetKeyboardState(), or poll your events, etc.)
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// TODO: fill all fields of IO structure and call NewFrame
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ImGuiIO& io = ImGui::GetIO();
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io.DeltaTime = 1.0f/60.0f;
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io.MousePos = mouse_pos;
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io.MouseDown[0] = mouse_button_0;
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io.MouseDown[1] = mouse_button_1;
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io.KeysDown[i] = ...
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// 4) render & swap video buffers
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ImGui::Render();
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SwapBuffers();
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}
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// 2) call NewFrame(), after this point you can use ImGui::* functions anytime
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ImGui::NewFrame();
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- You can read back 'io.WantCaptureMouse', 'io.WantCaptureKeybord' etc. flags from the IO structure to tell how ImGui intends to use your
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inputs and to know if you should share them or hide them from the rest of your application. Read the FAQ below for more information.
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// 3) most of your application code here
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MyGameUpdate(); // may use any ImGui functions, e.g. ImGui::Begin("My window"); ImGui::Text("Hello, world!"); ImGui::End();
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MyGameRender(); // may use any ImGui functions
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// 4) render & swap video buffers
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ImGui::Render();
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SwapBuffers();
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}
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- You can read back 'io.WantCaptureMouse', 'io.WantCaptureKeybord' etc. flags from the IO structure to tell how ImGui intends to use your
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inputs and to know if you should share them or hide them from the rest of your application. Read the FAQ below for more information.
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USING GAMEPAD/KEYBOARD NAVIGATION [BETA]
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- Gamepad/keyboard navigation support is available, it is currently in Beta and has issues. Your feedback and bug reports are welcome.
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- See https://github.com/ocornut/imgui/issues/323 for discussion thread and ask questions.
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- The current primary focus is to support game controllers.
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- Consider emulating a mouse cursor with DualShock4 touch pad or a spare analog stick as a mouse-emulation fallback.
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- Consider using Synergy host (on your computer) + uSynergy.c (in your console/tablet/phone app) to use PC mouse/keyboard.
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- Being able to share and transition inputs between imgui navigation and your own game/application is tricky, and may requires further work on imgui.
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For gamepad use, the easiest approach is to go all-or-nothing, with a buttons combo that toggle your inputs between imgui and your game/application.
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For more advanced uses, you may want to use:
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- io.NavUsable: true when a window is focused and it doesn't have the ImGuiWindowFlags_NoNavInputs flag set.
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- io.NavActive: true when the navigation cursor is visible (and usually goes false when mouse is used).
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- query focus information with IsWindowFocused(), IsAnyWindowFocused(), IsAnyItemFocused() functions.
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The reality is more complex than what those flags can express. Please discuss your issues and usage scenario in the thread above.
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As we head toward more keyboard-oriented development this aspect will need to be improved.
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- It is recommended that you enable the 'io.NavMovesMouse' option. Enabling it instructs ImGui that it can request moving your move cursor to track navigated items and ease readability.
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When enabled and using directional navigation (with d-pad or arrow keys), the NewFrame() functions may alter 'io.MousePos' and set 'io.WantMoveMouse' to notify you that it did so.
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When that happens your back-end will need to move the OS mouse cursor on the _next_ frame. The examples binding in examples/ do that.
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// Application init
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io.NavMovesMouse = true;
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// Application main loop
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if (io.WantMoveMouse)
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MyFuncToSetMousePosition(io.MousePos.x, io.MousePos.y);
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ImGui::NewFrame();
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In a setup when you may not have easy control over the mouse cursor (e.g. uSynergy doesn't expose changing remote mouse cursor),
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you might want to set a boolean to request ignoring your other external mouse positions until they move again.
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API BREAKING CHANGES
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@ -266,7 +299,7 @@
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Q: How can I help?
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A: - If you are experienced enough with ImGui and with C/C++, look at the todo list and see how you want/can help!
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- Become a Patron/donate. Convince your company to become a Patron or provide serious funding for development time.
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- Become a Patron/donate! Convince your company to become a Patron or provide serious funding for development time! See http://www.patreon.com/imgui
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Q: How do I update to a newer version of ImGui?
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A: Overwrite the following files:
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@ -480,9 +513,9 @@
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- window/tooltip: allow to set the width of a tooltip to allow TextWrapped() etc. while keeping the height automatic.
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- window: increase minimum size of a window with menus or fix the menu rendering so that it doesn't look odd.
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- draw-list: maintaining bounding box per command would allow to merge draw command when clipping isn't relied on (typical non-scrolling window or non-overflowing column would merge with previous command).
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!- scrolling: allow immediately effective change of scroll if we haven't appended items yet
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!- scrolling: allow immediately effective change of scroll after Begin() if we haven't appended items yet
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- splitter/separator: formalize the splitter idiom into an official api (we want to handle n-way split) (#319)
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- widgets: display mode: widget-label, label-widget (aligned on column or using fixed size), label-newline-tab-widget etc.
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- widgets: display mode: widget-label, label-widget (aligned on column or using fixed size), label-newline-tab-widget etc. (#395)
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- widgets: clean up widgets internal toward exposing everything.
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- widgets: add disabled and read-only modes (#211)
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- main: considering adding an Init() function? some constructs are awkward in the implementation because of the lack of them.
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@ -532,7 +565,6 @@
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- popups: border options. richer api like BeginChild() perhaps? (#197)
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- tooltip: tooltip that doesn't fit in entire screen seems to lose their "last prefered button" and may teleport when moving mouse
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- menus: local shortcuts, global shortcuts (#456, #126)
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- menus: icons
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- menus: menubars: some sort of priority / effect of main menu-bar on desktop size?
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- menus: calling BeginMenu() twice with a same name doesn't seem to append nicely
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- statusbar: add a per-window status bar helper similar to what menubar does.
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@ -563,6 +595,7 @@
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- textwrapped: figure out better way to use TextWrapped() in an always auto-resize context (tooltip, etc.) (#249)
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- settings: write more decent code to allow saving/loading new fields
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- settings: api for per-tool simple persistent data (bool,int,float,columns sizes,etc.) in .ini file
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- stb: add defines to disable stb implementations
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- style: add window shadows.
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- style/optimization: store rounded corners in texture to use 1 quad per corner (filled and wireframe) to lower the cost of rounding.
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- style: color-box not always square?
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@ -570,7 +603,7 @@
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- style: try to make PushStyleVar() more robust to incorrect parameters (to be more friendly to edit & continues situation).
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- style/opt: PopStyleVar could be optimized by having GetStyleVar returns the type, using a table mapping stylevar enum to data type.
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- style: global scale setting.
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- style: WindowPadding needs to be EVEN needs the 0.5 multiplier probably have a subtle effect on clip rectangle
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- style: WindowPadding needs to be EVEN as the 0.5 multiplier used on this value probably have a subtle effect on clip rectangle
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- text: simple markup language for color change?
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- font: dynamic font atlas to avoid baking huge ranges into bitmap and make scaling easier.
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- font: small opt: for monospace font (like the defalt one) we can trim IndexXAdvance as long as trailing value is == FallbackXAdvance
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@ -583,6 +616,7 @@
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- log: let user copy any window content to clipboard easily (CTRL+C on windows? while moving it? context menu?). code is commented because it fails with multiple Begin/End pairs.
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- filters: set a current filter that tree node can automatically query to hide themselves
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- filters: handle wildcards (with implicit leading/trailing *), regexps
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- filters: fuzzy matches (may use code at blog.forrestthewoods.com/4cffeed33fdb)
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- shortcuts: add a shortcut api, e.g. parse "&Save" and/or "Save (CTRL+S)", pass in to widgets or provide simple ways to use (button=activate, input=focus)
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!- keyboard: tooltip & combo boxes are messing up / not honoring keyboard tabbing
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- keyboard: full keyboard navigation and focus. (#323)
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