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Added ImGuiWindowFlags_ResizeFromAnySide flag and code to resize from…
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… any of the 4 corners (only 2 corners enabled). (#822)
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@ocornut
ocornut committed Dec 6, 2017
1 parent fe2cf23 commit 90ae1c5
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Showing 2 changed files with 85 additions and 30 deletions.
113 changes: 83 additions & 30 deletions imgui.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -4198,6 +4198,37 @@ static ImGuiCol GetWindowBgColorIdxFromFlags(ImGuiWindowFlags flags)
return ImGuiCol_WindowBg;
}

static void CalcResizePosSizeFromAnyCorner(ImGuiWindow* window, const ImVec2& corner_target, const ImVec2& corner_norm, ImVec2* out_pos, ImVec2* out_size)
{
ImVec2 pos_min = ImLerp(corner_target, window->Pos, corner_norm); // Expected window upper-left
ImVec2 pos_max = ImLerp(window->Pos + window->Size, corner_target, corner_norm); // Expected window lower-right
ImVec2 size_expected = pos_max - pos_min;
ImVec2 size_constrained = CalcSizeFullWithConstraint(window, size_expected);
*out_pos = pos_min;
if (corner_norm.x == 0.0f)
out_pos->x -= (size_constrained.x - size_expected.x);
if (corner_norm.y == 0.0f)
out_pos->y -= (size_constrained.y - size_expected.y);
*out_size = size_constrained;
}

struct ImGuiResizeGripDef
{
const char* StrId;
ImVec2 CornerNorm;
ImVec2 InnerDir;
int AngleMin12, AngleMax12;
ImGuiMouseCursor MouseCursor;
};

const ImGuiResizeGripDef resize_grip_def[4] =
{
{ "#RESIZE0", ImVec2(1,1), ImVec2(-1,-1), 0, 3, ImGuiMouseCursor_ResizeNWSE }, // Lower right
{ "#RESIZE1", ImVec2(0,1), ImVec2(+1,-1), 3, 6, ImGuiMouseCursor_ResizeNESW }, // Lower left
{ "#RESIZE2", ImVec2(0,0), ImVec2(+1,+1), 6, 9, ImGuiMouseCursor_ResizeNWSE }, // Upper left
{ "#RESIZE3", ImVec2(1,0), ImVec2(-1,+1), 9,12, ImGuiMouseCursor_ResizeNESW }, // Upper right
};

// Push a new ImGui window to add widgets to.
// - A default window called "Debug" is automatically stacked at the beginning of every frame so you can use widgets without explicitly calling a Begin/End pair.
// - Begin/End can be called multiple times during the frame with the same window name to append content.
Expand Down Expand Up @@ -4533,39 +4564,58 @@ bool ImGui::Begin(const char* name, bool* p_open, ImGuiWindowFlags flags)
}
else
{
ImU32 resize_col = 0;
const float resize_corner_size = ImMax(g.FontSize * 1.35f, window_rounding + 1.0f + g.FontSize * 0.2f);
// Handle resize for: Resize Grips, Gamepad
ImU32 resize_grip_col[4] = { 0 };
const int resize_grip_count = (flags & ImGuiWindowFlags_ResizeFromAnySide) ? 2 : 1; // 4
const float resize_corner_size = (float)(int)ImMax(g.FontSize * 1.35f, window_rounding + 1.0f + g.FontSize * 0.2f);
if (!(flags & ImGuiWindowFlags_AlwaysAutoResize) && window->AutoFitFramesX <= 0 && window->AutoFitFramesY <= 0 && !(flags & ImGuiWindowFlags_NoResize))
{
// Manual resize
// Using the FlattenChilds button flag, we make the resize button accessible even if we are hovering over a child window
const ImVec2 br = window->Rect().GetBR();
const ImRect resize_rect(br - ImFloor(ImVec2(resize_corner_size * 0.75f, resize_corner_size * 0.75f)), br);
const ImGuiID resize_id = window->GetID("#RESIZE");
bool hovered, held;
ButtonBehavior(resize_rect, resize_id, &hovered, &held, ImGuiButtonFlags_FlattenChilds);
resize_col = GetColorU32(held ? ImGuiCol_ResizeGripActive : hovered ? ImGuiCol_ResizeGripHovered : ImGuiCol_ResizeGrip);
if (hovered || held)
g.MouseCursor = ImGuiMouseCursor_ResizeNWSE;
ImVec2 pos_target(FLT_MAX, FLT_MAX);
ImVec2 size_target(FLT_MAX, FLT_MAX);

ImVec2 size_target(FLT_MAX,FLT_MAX);
if (g.HoveredWindow == window && held && g.IO.MouseDoubleClicked[0])
// Manual resize grips
for (int resize_grip_n = 0; resize_grip_n < resize_grip_count; resize_grip_n++)
{
// Manual auto-fit when double-clicking
size_target = size_auto_fit;
ClearActiveID();
const ImGuiResizeGripDef& grip = resize_grip_def[resize_grip_n];
const ImVec2 corner = ImLerp(window->Pos, window->Pos + window->Size, grip.CornerNorm);

// Using the FlattenChilds button flag we make the resize button accessible even if we are hovering over a child window
ImRect resize_rect;
resize_rect.Add(corner);
resize_rect.Add(corner + grip.InnerDir * (float)(int)(resize_corner_size * 0.75f));
bool hovered, held;
ButtonBehavior(resize_rect, window->GetID(grip.StrId), &hovered, &held, ImGuiButtonFlags_FlattenChilds);
if (hovered || held)
g.MouseCursor = grip.MouseCursor;

if (g.HoveredWindow == window && held && g.IO.MouseDoubleClicked[0])
{
// Manual auto-fit when double-clicking
size_target = CalcSizeFullWithConstraint(window, size_auto_fit);
ClearActiveID();
}
else if (held)
{
// Resize from any of the four corners
// We don't use an incremental MouseDelta but rather compute an absolute target size based on mouse position
ImVec2 corner_target = g.IO.MousePos - g.ActiveIdClickOffset + resize_rect.GetSize() * grip.CornerNorm; // Corner of the window corresponding to our corner grip
CalcResizePosSizeFromAnyCorner(window, corner_target, grip.CornerNorm, &pos_target, &size_target);
}
resize_grip_col[resize_grip_n] = GetColorU32(held ? ImGuiCol_ResizeGripActive : hovered ? ImGuiCol_ResizeGripHovered : ImGuiCol_ResizeGrip);
}
else if (held)

// Apply back modified position/size to window
if (size_target.x != FLT_MAX)
{
// We don't use an incremental MouseDelta but rather compute an absolute target size based on mouse position
size_target = (g.IO.MousePos - g.ActiveIdClickOffset - window->Pos) + resize_rect.GetSize();
window->SizeFull = size_target;
MarkIniSettingsDirty(window);
}

if (size_target.x != FLT_MAX && size_target.y != FLT_MAX)
if (pos_target.x != FLT_MAX)
{
window->SizeFull = CalcSizeFullWithConstraint(window, size_target);
window->Pos = window->PosFloat = ImVec2((float)(int)pos_target.x, (float)(int)pos_target.y);
MarkIniSettingsDirty(window);
}

window->Size = window->SizeFull;
title_bar_rect = window->TitleBarRect();
}
Expand Down Expand Up @@ -4595,15 +4645,18 @@ bool ImGui::Begin(const char* name, bool* p_open, ImGuiWindowFlags flags)
if (window->ScrollbarY)
Scrollbar(ImGuiLayoutType_Vertical);

// Render resize grip
// (after the input handling so we don't have a frame of latency)
// Render resize grips (after their input handling so we don't have a frame of latency)
if (!(flags & ImGuiWindowFlags_NoResize))
{
const ImVec2 br = window->Rect().GetBR();
window->DrawList->PathLineTo(br + ImVec2(-resize_corner_size, -window_border_size));
window->DrawList->PathLineTo(br + ImVec2(-window_border_size, -resize_corner_size));
window->DrawList->PathArcToFast(ImVec2(br.x - window_rounding - window_border_size, br.y - window_rounding - window_border_size), window_rounding, 0, 3);
window->DrawList->PathFillConvex(resize_col);
for (int resize_grip_n = 0; resize_grip_n < resize_grip_count; resize_grip_n++)
{
const ImGuiResizeGripDef& grip = resize_grip_def[resize_grip_n];
const ImVec2 corner = ImLerp(window->Pos, window->Pos + window->Size, grip.CornerNorm);
window->DrawList->PathLineTo(corner + grip.InnerDir * ((resize_grip_n & 1) ? ImVec2(window_border_size, resize_corner_size) : ImVec2(resize_corner_size, window_border_size)));
window->DrawList->PathLineTo(corner + grip.InnerDir * ((resize_grip_n & 1) ? ImVec2(resize_corner_size, window_border_size) : ImVec2(window_border_size, resize_corner_size)));
window->DrawList->PathArcToFast(ImVec2(corner.x + grip.InnerDir.x * (window_rounding + window_border_size), corner.y + grip.InnerDir.y * (window_rounding + window_border_size)), window_rounding, grip.AngleMin12, grip.AngleMax12);
window->DrawList->PathFillConvex(resize_grip_col[resize_grip_n]);
}
}

// Borders
Expand Down
2 changes: 2 additions & 0 deletions imgui.h
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Original file line number Diff line number Diff line change
Expand Up @@ -513,6 +513,8 @@ enum ImGuiWindowFlags_
ImGuiWindowFlags_AlwaysVerticalScrollbar= 1 << 14, // Always show vertical scrollbar (even if ContentSize.y < Size.y)
ImGuiWindowFlags_AlwaysHorizontalScrollbar=1<< 15, // Always show horizontal scrollbar (even if ContentSize.x < Size.x)
ImGuiWindowFlags_AlwaysUseWindowPadding = 1 << 16, // Ensure child windows without border uses style.WindowPadding (ignored by default for non-bordered child windows, because more convenient)
ImGuiWindowFlags_ResizeFromAnySide = 1 << 17,

// [Internal]
ImGuiWindowFlags_ChildWindow = 1 << 22, // Don't use! For internal use by BeginChild()
ImGuiWindowFlags_ComboBox = 1 << 23, // Don't use! For internal use by ComboBox()
Expand Down

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