Merge branch 'master' into 2016-02-colorpicker

imgui.cpp

@@ -16,6 +16,8 @@
  - MISSION STATEMENT
  - END-USER GUIDE
  - PROGRAMMER GUIDE (read me!)
+   - Read first
+   - Getting started with integrating imgui in your code/engine
  - API BREAKING CHANGES (read me when you update!)
  - FREQUENTLY ASKED QUESTIONS (FAQ), TIPS
    - How can I help?
@@ -50,22 +52,21 @@
  Designed for developers and content-creators, not the typical end-user! Some of the weaknesses includes:
  - doesn't look fancy, doesn't animate
  - limited layout features, intricate layouts are typically crafted in code
- - 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.
 
 
  END-USER GUIDE
  ==============
 
- - double-click title bar to collapse window
- - click upper right corner to close a window, available when 'bool* p_open' is passed to ImGui::Begin()
- - click and drag on lower right corner to resize window
- - click and drag on any empty space to move window
- - double-click/double-tap on lower right corner grip to auto-fit to content
+ - Double-click title bar to collapse window
+ - Click upper right corner to close a window, available when 'bool* p_open' is passed to ImGui::Begin()
+ - Click and drag on lower right corner to resize window
+ - Click and drag on any empty space to move window
+ - Double-click/double-tap on lower right corner grip to auto-fit to content
  - TAB/SHIFT+TAB to cycle through keyboard editable fields
- - use mouse wheel to scroll
- - use CTRL+mouse wheel to zoom window contents (if IO.FontAllowScaling is true)
+ - Use mouse wheel to scroll
+ - Use CTRL+mouse wheel to zoom window contents (if io.FontAllowScaling is true)
  - CTRL+Click on a slider or drag box to input value as text
- - text editor:
+ - Text editor:
    - Hold SHIFT or use mouse to select text.
    - CTRL+Left/Right to word jump
    - CTRL+Shift+Left/Right to select words
@@ -74,76 +75,80 @@
    - CTRL+Z,CTRL+Y to undo/redo
    - ESCAPE to revert text to its original value
    - You can apply arithmetic operators +,*,/ on numerical values. Use +- to subtract (because - would set a negative value!)
+   - Controls are automatically adjusted for OSX to match standard OSX text editing operations.
 
 
  PROGRAMMER GUIDE
  ================
 
- - read the FAQ below this section!
- - 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.
- - call and read ImGui::ShowTestWindow() for demo code demonstrating most features.
- - see examples/ folder for standalone sample applications. Prefer reading examples/opengl2_example/ first as it is the simplest.
-   you may be able to grab and copy a ready made imgui_impl_*** file from the examples/.
- - 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).
-
- - getting started:
-   - init: call ImGui::GetIO() to retrieve the ImGuiIO structure and fill the fields marked 'Settings'.
-   - init: call io.Fonts->GetTexDataAsRGBA32(...) and load the font texture pixels into graphics memory.
-   - every frame:
-      1/ in your mainloop or right after you got your keyboard/mouse info, call ImGui::GetIO() and fill the fields marked 'Input'
-      2/ call ImGui::NewFrame() as early as you can!
-      3/ use any ImGui function you want between NewFrame() and Render()
-      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.
-         (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.)
-   - all rendering information are stored into command-lists until ImGui::Render() is called.
-   - ImGui never touches or know about your GPU state. the only function that knows about GPU is the RenderDrawListFn handler that you provide.
-   - 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.
-   - refer to the examples applications in the examples/ folder for instruction on how to setup your code.
-   - a typical application skeleton may be:
-
-        // Application init
-        ImGuiIO& io = ImGui::GetIO();
-        io.DisplaySize.x = 1920.0f;
-        io.DisplaySize.y = 1280.0f;
-        io.IniFilename = "imgui.ini";
-        io.RenderDrawListsFn = my_render_function;  // Setup a render function, or set to NULL and call GetDrawData() after Render() to access the render data.
-        // TODO: Fill others settings of the io structure
-
-        // Load texture atlas
-        // There is a default font so you don't need to care about choosing a font yet
-        unsigned char* pixels;
-        int width, height;
-        io.Fonts->GetTexDataAsRGBA32(pixels, &width, &height);
-        // TODO: At this points you've got a texture pointed to by 'pixels' and you need to upload that your your graphic system
-        // TODO: Store your texture pointer/identifier (whatever your engine uses) in 'io.Fonts->TexID'
-
-        // Application main loop
-        while (true)
-        {
-            // 1) get low-level inputs (e.g. on Win32, GetKeyboardState(), or poll your events, etc.)
-            // TODO: fill all fields of IO structure and call NewFrame
-            ImGuiIO& io = ImGui::GetIO();
-            io.DeltaTime = 1.0f/60.0f;
-            io.MousePos = mouse_pos;
-            io.MouseDown[0] = mouse_button_0;
-            io.MouseDown[1] = mouse_button_1;
-            io.KeysDown[i] = ...
-
-            // 2) call NewFrame(), after this point you can use ImGui::* functions anytime
-            ImGui::NewFrame();
-
-            // 3) most of your application code here
-            MyGameUpdate(); // may use any ImGui functions, e.g. ImGui::Begin("My window"); ImGui::Text("Hello, world!"); ImGui::End();
-            MyGameRender(); // may use any ImGui functions
-
-            // 4) render & swap video buffers
-            ImGui::Render();
-            SwapBuffers();
-        }
+ READ FIRST
+
+ - Read the FAQ below this section!
+ - 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.
+ - Call and read ImGui::ShowTestWindow() for demo code demonstrating most features.
+ - 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).
+
+ GETTING STARTED WITH INTEGRATING IMGUI IN YOUR CODE/ENGINE
+
+ - See examples/ folder for standalone sample applications. Prefer reading examples/opengl_example/ first as it is the simplest.
+   You may be able to grab and copy a ready made imgui_impl_*** file from the examples/.
+ - Init: call ImGui::GetIO() to retrieve the ImGuiIO structure and fill the fields marked 'Settings'.
+ - Init: call io.Fonts->GetTexDataAsRGBA32(...) and load the font texture pixels into graphics memory.
+ - Every frame:
+    1/ in your mainloop or right after you got your keyboard/mouse info, call ImGui::GetIO() and fill the fields marked 'Input'
+    2/ call ImGui::NewFrame() as early as you can!
+    3/ use any ImGui function you want between NewFrame() and Render()
+    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.
+       (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.)
+ - All rendering information are stored into command-lists until ImGui::Render() is called.
+ - ImGui never touches or knows about your GPU state. the only function that knows about GPU is the RenderDrawListFn handler that you provide.
+ - 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.
+ - Refer to the examples applications in the examples/ folder for instruction on how to setup your code.
+ - A typical application skeleton may be:
+
+     // Application init
+     ImGuiIO& io = ImGui::GetIO();
+     io.DisplaySize.x = 1920.0f;
+     io.DisplaySize.y = 1280.0f;
+     io.IniFilename = "imgui.ini";
+     io.RenderDrawListsFn = my_render_function;  // Setup a render function, or set to NULL and call GetDrawData() after Render() to access the render data.
+     // TODO: Fill others settings of the io structure
+
+     // Load texture atlas (there is a default font so you don't need to care about choosing a font yet)
+     unsigned char* pixels;
+     int width, height;
+     io.Fonts->GetTexDataAsRGBA32(pixels, &width, &height);
+     // TODO: At this points you've got a texture pointed to by 'pixels' and you need to upload that your your graphic system
+     // TODO: Store your texture pointer/identifier (whatever your engine uses) in 'io.Fonts->TexID'
+
+     // Application main loop
+     while (true)
+     {
+       // 1) get low-level inputs (e.g. on Win32, GetKeyboardState(), or poll your events, etc.)
+       // TODO: fill all fields of IO structure and call NewFrame
+       ImGuiIO& io = ImGui::GetIO();
+       io.DeltaTime = 1.0f/60.0f;
+       io.MousePos = mouse_pos;
+       io.MouseDown[0] = mouse_button_0;
+       io.MouseDown[1] = mouse_button_1;
+       io.KeysDown[i] = ...
+
+       // 2) call NewFrame(), after this point you can use ImGui::* functions anytime
+       ImGui::NewFrame();
+
+       // 3) most of your application code here
+       MyGameUpdate(); // may use any ImGui functions, e.g. ImGui::Begin("My window"); ImGui::Text("Hello, world!"); ImGui::End();
+       MyGameRender(); // may use any ImGui functions
+     
+       // 4) render & swap video buffers
+       ImGui::Render();
+       SwapBuffers();
+     }
+
+ - When calling NewFrame(), the 'io.WantCaptureMouse'/'io.WantCaptureKeyboard'/'io.WantTextInput' flags are updated. 
+   They tell you if ImGui intends to use your inputs. So for example, if 'io.WantCaptureMouse' is set you would typically want to hide 
+   mouse inputs from the rest of your application. Read the FAQ below for more information about those flags.
 
-   - When calling NewFrame(), the 'io.WantCaptureMouse'/'io.WantCaptureKeyboard'/'io.WantTextInput' flags are updated. 
-     They tell you if ImGui intends to use your inputs. So for example, if 'io.WantCaptureMouse' is set you would typically want to hide 
-     mouse inputs from the rest of your application. Read the FAQ below for more information about those flags.
 
 
  API BREAKING CHANGES
@@ -272,7 +277,7 @@
 
  Q: How can I help?
  A: - If you are experienced enough with ImGui and with C/C++, look at the todo list and see how you want/can help!
-    - Become a Patron/donate. Convince your company to become a Patron or provide serious funding for development time.
+    - Become a Patron/donate! Convince your company to become a Patron or provide serious funding for development time! See http://www.patreon.com/imgui
 
  Q: How do I update to a newer version of ImGui?
  A: Overwrite the following files:
@@ -493,9 +498,9 @@
  - window/tooltip: allow to set the width of a tooltip to allow TextWrapped() etc. while keeping the height automatic.
  - window: increase minimum size of a window with menus or fix the menu rendering so that it doesn't look odd.
  - 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).
-!- scrolling: allow immediately effective change of scroll if we haven't appended items yet
+!- scrolling: allow immediately effective change of scroll after Begin() if we haven't appended items yet
  - splitter/separator: formalize the splitter idiom into an official api (we want to handle n-way split) (#319)
- - widgets: display mode: widget-label, label-widget (aligned on column or using fixed size), label-newline-tab-widget etc.
+ - widgets: display mode: widget-label, label-widget (aligned on column or using fixed size), label-newline-tab-widget etc. (#395)
  - widgets: clean up widgets internal toward exposing everything.
  - widgets: add disabled and read-only modes (#211)
  - main: considering adding an Init() function? some constructs are awkward in the implementation because of the lack of them.
@@ -577,13 +582,14 @@
  - textwrapped: figure out better way to use TextWrapped() in an always auto-resize context (tooltip, etc.) (#249)
  - settings: write more decent code to allow saving/loading new fields
  - settings: api for per-tool simple persistent data (bool,int,float,columns sizes,etc.) in .ini file
+ - stb: add defines to disable stb implementations
  - style: add window shadows.
  - style/optimization: store rounded corners in texture to use 1 quad per corner (filled and wireframe) to lower the cost of rounding.
  - style: color-box not always square?
  - style: a concept of "compact style" that the end-user can easily rely on (e.g. PushStyleCompact()?) that maps to other settings? avoid implementing duplicate helpers such as SmallCheckbox(), etc.
  - style: try to make PushStyleVar() more robust to incorrect parameters (to be more friendly to edit & continues situation).
  - style: global scale setting.
- - style: WindowPadding needs to be EVEN needs the 0.5 multiplier probably have a subtle effect on clip rectangle
+ - style: WindowPadding needs to be EVEN as the 0.5 multiplier used on this value probably have a subtle effect on clip rectangle
  - text: simple markup language for color change?
  - font: dynamic font atlas to avoid baking huge ranges into bitmap and make scaling easier.
  - font: small opt: for monospace font (like the defalt one) we can trim IndexXAdvance as long as trailing value is == FallbackXAdvance
@@ -596,6 +602,7 @@
  - 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.
  - filters: set a current filter that tree node can automatically query to hide themselves
  - filters: handle wildcards (with implicit leading/trailing *), regexps
+ - filters: fuzzy matches (may use code at blog.forrestthewoods.com/4cffeed33fdb)
  - 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)
 !- keyboard: tooltip & combo boxes are messing up / not honoring keyboard tabbing
  - keyboard: full keyboard navigation and focus. (#323)
@@ -5336,7 +5343,7 @@ float ImGui::GetScrollY()
 float ImGui::GetScrollMaxX()
 {
     ImGuiWindow* window = GetCurrentWindowRead();
-    return ImMax(0.0f, window->SizeContents.x - (window->SizeFull.x - window->ScrollbarSizes.x) + 50);
+    return ImMax(0.0f, window->SizeContents.x - (window->SizeFull.x - window->ScrollbarSizes.x));
 }
 
 float ImGui::GetScrollMaxY()
@@ -6479,6 +6486,7 @@ static bool DataTypeApplyOpFromText(const char* buf, const char* initial_value_b
 }
 
 // Create text input in place of a slider (when CTRL+Clicking on slider)
+// FIXME: Logic is messy and confusing.
 bool ImGui::InputScalarAsWidgetReplacement(const ImRect& aabb, const char* label, ImGuiDataType data_type, void* data_ptr, ImGuiID id, int decimal_precision)
 {
     ImGuiContext& g = *GImGui;
@@ -6492,9 +6500,8 @@ bool ImGui::InputScalarAsWidgetReplacement(const ImRect& aabb, const char* label
     char buf[32];
     DataTypeFormatString(data_type, data_ptr, decimal_precision, buf, IM_ARRAYSIZE(buf));
     bool text_value_changed = InputTextEx(label, buf, IM_ARRAYSIZE(buf), aabb.GetSize(), ImGuiInputTextFlags_CharsDecimal | ImGuiInputTextFlags_AutoSelectAll);
-    if (g.ScalarAsInputTextId == 0)
+    if (g.ScalarAsInputTextId == 0)     // First frame we started displaying the InputText widget
     {
-        // First frame
         IM_ASSERT(g.ActiveId == id);    // InputText ID expected to match the Slider ID (else we'd need to store them both, which is also possible)
         g.ScalarAsInputTextId = g.ActiveId;
         SetHoveredID(id);
@@ -10410,6 +10417,7 @@ void ImGui::ShowMetricsWindow(bool* p_open)
             ImGui::Text("HoveredRootWindow: '%s'", g.HoveredRootWindow ? g.HoveredRootWindow->Name : "NULL");
             ImGui::Text("HoveredID: 0x%08X/0x%08X", g.HoveredId, g.HoveredIdPreviousFrame); // Data is "in-flight" so depending on when the Metrics window is called we may see current frame information or not
             ImGui::Text("ActiveID: 0x%08X/0x%08X", g.ActiveId, g.ActiveIdPreviousFrame);
+            ImGui::Text("ActiveIdWindow: '%s", g.ActiveIdWindow ? g.ActiveIdWindow->Name : "NULL");
             ImGui::TreePop();
         }
     }