// sixten: Rows and columns.
inline void UI_RowBegin(void)
{
    UI_SetNextLayoutAxis(Axis2_X);
    ui_box *Box = UI_MakeBox(0, StrLit(""));
    UI_PushParent(Box);
}

inline void UI_RowEnd(void)
{
    UI_PopParent();
}

inline void UI_ColumnBegin(void)
{
    UI_SetNextLayoutAxis(Axis2_Y);
    ui_box *Box = UI_MakeBox(0, StrLit(""));
    UI_PushParent(Box);
}

inline void UI_ColumnEnd(void)
{
    UI_PopParent();
}

#define UI_Row DeferLoop(UI_RowBegin(), UI_RowEnd())
#define UI_Column DeferLoop(UI_ColumnBegin(), UI_ColumnEnd())

// sixten: Compositions
inline void UI_PushAxisSize(axis2 Axis, ui_size Size)
{
    if(Axis == Axis2_X)
    {
        UI_PushWidth(Size);
    }
    else
    {
        UI_PushHeight(Size);
    }
}

inline void UI_PopAxisSize(axis2 Axis)
{
    if(Axis == Axis2_X)
    {
        UI_PopWidth();
    }
    else
    {
        UI_PopHeight();
    }
}

inline void UI_SetNextAxisSize(axis2 Axis, ui_size Size)
{
    if(Axis == Axis2_X)
    {
        UI_SetNextWidth(Size);
    }
    else
    {
        UI_SetNextHeight(Size);
    }
}

#define UI_AxisSize(Axis, Size) DeferLoop(UI_PushAxisSize(Axis, Size), UI_PopAxisSize(Axis))

#define UI_Size(Width, Height) UI_Width(Width) UI_Height(Height) 
#define UI_PushSize(Width, Height) UI_PushWidth(Width); UI_PushHeight(Height) 
#define UI_PopSize() UI_PopWidth(); UI_PopHeight() 
#define UI_SetNextSize(Width, Height) UI_SetNextWidth(Width); UI_SetNextHeight(Height) 

#define UI_FixedP(Value) UI_FixedX(Value.x) UI_FixedY(Value.y) 
#define UI_SetNextFixedP(Value) UI_SetNextFixedX(Value.x); UI_SetNextFixedY(Value.y) 

// sixten: Spacing
static ui_box *UI_NamedSpacer(ui_size Size, string String)
{
    ui_box *Parent = UI_TopParent();
    UI_SetNextAxisSize(Parent->LayoutAxis, Size);
    
    ui_box *Box = UI_MakeBox(0, String);
    return(Box);
}

static ui_box *UI_NamedSpacerF(ui_size Size, char *Format, ...)
{
    temporary_memory Scratch = GetScratch(0, 0);
    
    va_list Arguments;
    va_start(Arguments, Format);
    string String = PushFormatVariadic(Scratch.Arena, Format, Arguments);
    va_end(Arguments);
    
    ui_box *Box = UI_NamedSpacer(Size, String);
    
    ReleaseScratch(Scratch);
    
    return(Box);
}

static void UI_Spacer(ui_size Size)
{
    UI_NamedSpacer(Size, StrLit(""));
}

#define UI_Padding(Size) DeferLoop(UI_Spacer(Size), UI_Spacer(Size))

// sixten: Common widgets
static ui_box *UI_Label(string String)
{
    ui_box *Box = UI_MakeBox(UI_BoxFlag_DrawText, String);
    return(Box);
}

static ui_box *UI_LabelF(char *Format, ...)
{
    temporary_memory Scratch = GetScratch(0, 0);
    
    va_list Arguments;
    va_start(Arguments, Format);
    string String = PushFormatVariadic(Scratch.Arena, Format, Arguments);
    va_end(Arguments);
    
    ui_box *Box = UI_MakeBox(UI_BoxFlag_DrawText, String);
    
    ReleaseScratch(Scratch);
    
    return(Box);
}

static ui_signal UI_Button(string String)
{
    ui_box *Box = UI_MakeBox(UI_BoxFlag_DrawText|
                             UI_BoxFlag_DrawBackground|
                             UI_BoxFlag_DrawBorder|
                             UI_BoxFlag_HotAnimation|
                             UI_BoxFlag_ActiveAnimation|
                             UI_BoxFlag_Clickable,
                             String);
    ui_signal Signal = UI_SignalFromBox(Box);
    return(Signal);
}

static ui_signal UI_ButtonF(char *Format, ...)
{
    temporary_memory Scratch = GetScratch(0, 0);
    
    va_list Arguments;
    va_start(Arguments, Format);
    string String = PushFormatVariadic(Scratch.Arena, Format, Arguments);
    va_end(Arguments);
    
    ui_box *Box = UI_MakeBox(UI_BoxFlag_DrawText|
                             UI_BoxFlag_DrawBackground|
                             UI_BoxFlag_DrawBorder|
                             UI_BoxFlag_HotAnimation|
                             UI_BoxFlag_ActiveAnimation|
                             UI_BoxFlag_Clickable,
                             String);
    ui_signal Signal = UI_SignalFromBox(Box);
    
    ReleaseScratch(Scratch);
    
    return(Signal);
}

static ui_signal UI_Checkbox(string String, b32 *Checked)
{
    UI_SetNextSize(UI_ChildrenSum(1, 1), UI_ChildrenSum(1, 1));
    UI_SetNextLayoutAxis(Axis2_X);
    
    ui_box *ContainerBox = UI_MakeBox(UI_BoxFlag_Clickable, String);
    UI_Parent(ContainerBox)
    {
        r32 OpacityTransition = AnimationCurve_AnimateValueF(*Checked, *Checked, 0.15, "UI Checkbox Transition %p", Checked);
        
        v4 TextColor = UI_TopTextColor();
        TextColor.a = OpacityTransition;
        
        UI_CornerRadius(2) UI_Size(UI_Em(1, 1), UI_Em(1, 1)) UI_Font(Font_Icons) UI_TextColor(TextColor)
            UI_MakeBoxF(UI_BoxFlag_DrawBorder|UI_BoxFlag_DrawText, "%U", FontIcon_Cancel);
        
        UI_Size(UI_TextContent(15, 1), UI_Em(1, 1)) UI_Label(String);
    }
    
    ui_signal Signal = UI_SignalFromBox(ContainerBox);
    if(Signal.Hovering)
    {
        Platform.SetCursor(PlatformCursor_Hand);
    }
    
    if(Signal.Pressed)
    {
        *Checked = !*Checked;
    }
    
    return(Signal);
}