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Added option for resize grip in the lower left corner of a window. #822

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Added option for resize grip in the lower left corner of a window. #822

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74 changes: 62 additions & 12 deletions imgui.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -4140,17 +4140,41 @@ bool ImGui::Begin(const char* name, bool* p_open, const ImVec2& size_on_first_us
}
else
{
ImU32 resize_col = 0;
ImU32 resize_col_br = 0;
ImU32 resize_col_bl = 0;
const float resize_corner_size = 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
const ImVec2 br = window->Rect().GetBR();
const ImRect resize_rect(br - 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);
const ImVec2 bl = window->Rect().GetBL();
const ImRect resize_rect_br(br - ImVec2(resize_corner_size * 0.75f, resize_corner_size * 0.75f), br);
const ImRect resize_rect_bl(bl + ImVec2(0.0f, -resize_corner_size * 0.75f), bl + ImVec2(resize_corner_size * 0.75f, 0.0f));

bool hovered = false;
bool held = false;
bool held_bl = false;
bool held_br = false;
bool hovered_bl = false;
bool hovered_br = false;

if(!(flags & ImGuiWindowFlags_ResizeLowerLeft))
{
const ImGuiID resize_id_br = window->GetID("#RESIZE_BR");
ButtonBehavior(resize_rect_br, resize_id_br, &hovered, &held, ImGuiButtonFlags_FlattenChilds);
held_br = held;
hovered_br = hovered;
}
if(((flags & ImGuiWindowFlags_ResizeLowerLeft) || (flags & ImGuiWindowFlags_ResizeLowerLeftAndRight)) && !held_br && !hovered_br)
{
const ImGuiID resize_id_bl = window->GetID("#RESIZE_BL");
ButtonBehavior(resize_rect_bl, resize_id_bl, &hovered, &held, ImGuiButtonFlags_FlattenChilds);
held_bl = held;
hovered_bl = hovered;
}

resize_col_br = GetColorU32(held_br ? ImGuiCol_ResizeGripActive : hovered_br ? ImGuiCol_ResizeGripHovered : ImGuiCol_ResizeGrip);
resize_col_bl = GetColorU32(held_bl ? ImGuiCol_ResizeGripActive : hovered_bl ? ImGuiCol_ResizeGripHovered : ImGuiCol_ResizeGrip);

if (hovered || held)
g.MouseCursor = ImGuiMouseCursor_ResizeNWSE;
Expand All @@ -4166,7 +4190,21 @@ bool ImGui::Begin(const char* name, bool* p_open, const ImVec2& size_on_first_us
else if (held)
{
// We don't use an incremental MouseDelta but rather compute an absolute target size based on mouse position
ApplySizeFullWithConstraint(window, (g.IO.MousePos - g.ActiveIdClickOffset + resize_rect.GetSize()) - window->Pos);
if(held_br)
{
ApplySizeFullWithConstraint(window, (g.IO.MousePos - g.ActiveIdClickOffset + resize_rect_br.GetSize()) - window->Pos);
}
else
{
ImVec2 size;
size.x = window->SizeFull.x + ((window->Pos.x + g.ActiveIdClickOffset.x) - g.IO.MousePos.x);
size.y = ((g.IO.MousePos.y - g.ActiveIdClickOffset.y) + resize_rect_bl.GetSize().y) - window->Pos.y;

window->PosFloat.x += (g.IO.MousePos.x - g.ActiveIdClickOffset.x) - resize_rect_bl.Min.x;
window->Pos.x = (float)int(window->PosFloat.x);
SetWindowPos(window->Pos);
ApplySizeFullWithConstraint(window, size);
}
if (!(flags & ImGuiWindowFlags_NoSavedSettings))
MarkSettingsDirty();
}
Expand Down Expand Up @@ -4220,11 +4258,23 @@ bool ImGui::Begin(const char* name, bool* p_open, const ImVec2& size_on_first_us
// (after the 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->BorderSize));
window->DrawList->PathLineTo(br + ImVec2(-window->BorderSize, -resize_corner_size));
window->DrawList->PathArcToFast(ImVec2(br.x - window_rounding - window->BorderSize, br.y - window_rounding - window->BorderSize), window_rounding, 0, 3);
window->DrawList->PathFill(resize_col);
if(!(flags & ImGuiWindowFlags_ResizeLowerLeft))
{
const ImVec2 br = window->Rect().GetBR();
window->DrawList->PathLineTo(br + ImVec2(-resize_corner_size, -window->BorderSize));
window->DrawList->PathLineTo(br + ImVec2(-window->BorderSize, -resize_corner_size));
window->DrawList->PathArcToFast(ImVec2(br.x - window_rounding - window->BorderSize, br.y - window_rounding - window->BorderSize), window_rounding, 0, 3);
window->DrawList->PathFill(resize_col_br);
}

if((flags & ImGuiWindowFlags_ResizeLowerLeft) || (flags & ImGuiWindowFlags_ResizeLowerLeftAndRight))
{
const ImVec2 bl = window->Rect().GetBL();
window->DrawList->PathLineTo(bl + ImVec2(window->BorderSize, -resize_corner_size));
window->DrawList->PathLineTo(bl + ImVec2(resize_corner_size, -window->BorderSize));
window->DrawList->PathArcToFast(ImVec2(bl.x + window_rounding + window->BorderSize, bl.y - window_rounding - window->BorderSize), window_rounding, 0, 3);
window->DrawList->PathFill(resize_col_bl);
}
}

// 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 @@ -496,6 +496,8 @@ 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_ResizeLowerLeft = 1 << 17, // Disable user resizing with the lower-left grip
ImGuiWindowFlags_ResizeLowerLeftAndRight= 1 << 18, // Disable user resizing with the lower-right grip
// [Internal]
ImGuiWindowFlags_ChildWindow = 1 << 20, // Don't use! For internal use by BeginChild()
ImGuiWindowFlags_ChildWindowAutoFitX = 1 << 21, // Don't use! For internal use by BeginChild()
Expand Down