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Windows: add resize grips for child windows with both ResizeX+ResizeY. (#8501)

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Aleksi Juvani 2025-03-19 14:11:01 +01:00 • committed by ocornut
parent 5f6eaa5278
commit 82e9a5e47d
1 changed files with 25 additions and 13 deletions
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38
imgui.cpp
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@ -6647,8 +6647,19 @@ static ImGuiCol GetWindowBgColorIdx(ImGuiWindow* window)
return ImGuiCol_WindowBg; return ImGuiCol_WindowBg;
} }
static void CalcResizePosSizeFromAnyCorner(ImGuiWindow* window, const ImVec2& corner_target, const ImVec2& corner_norm, ImVec2* out_pos, ImVec2* out_size) static void CalcResizePosSizeFromAnyCorner(ImGuiWindow* window, ImVec2 corner_target, const ImVec2& corner_norm, ImVec2* out_pos, ImVec2* out_size)
{ {
if (window->Flags & ImGuiWindowFlags_ChildWindow) // Clamp resizing of childs within parent
{
ImGuiWindow* parent_window = window->ParentWindow;
ImGuiWindowFlags parent_flags = parent_window->Flags;
ImRect corner_limit_rect = parent_window->InnerRect;
corner_limit_rect.Expand(ImVec2(-ImMax(parent_window->WindowPadding.x, parent_window->WindowBorderSize), -ImMax(parent_window->WindowPadding.y, parent_window->WindowBorderSize)));
if ((parent_flags & (ImGuiWindowFlags_HorizontalScrollbar | ImGuiWindowFlags_AlwaysHorizontalScrollbar)) == 0 || (parent_flags & ImGuiWindowFlags_NoScrollbar))
corner_target.x = ImClamp(corner_target.x, corner_limit_rect.Min.x, corner_limit_rect.Max.x);
if (parent_flags & ImGuiWindowFlags_NoScrollbar)
corner_target.y = ImClamp(corner_target.y, corner_limit_rect.Min.y, corner_limit_rect.Max.y);
}
ImVec2 pos_min = ImLerp(corner_target, window->Pos, corner_norm); // Expected window upper-left 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 pos_max = ImLerp(window->Pos + window->Size, corner_target, corner_norm); // Expected window lower-right
ImVec2 size_expected = pos_max - pos_min; ImVec2 size_expected = pos_max - pos_min;
@ -6868,17 +6879,6 @@ static int ImGui::UpdateWindowManualResize(ImGuiWindow* window, const ImVec2& si
ImVec2 clamp_min(border_n == ImGuiDir_Right ? clamp_rect.Min.x : -FLT_MAX, border_n == ImGuiDir_Down || (border_n == ImGuiDir_Up && window_move_from_title_bar) ? clamp_rect.Min.y : -FLT_MAX); ImVec2 clamp_min(border_n == ImGuiDir_Right ? clamp_rect.Min.x : -FLT_MAX, border_n == ImGuiDir_Down || (border_n == ImGuiDir_Up && window_move_from_title_bar) ? clamp_rect.Min.y : -FLT_MAX);
ImVec2 clamp_max(border_n == ImGuiDir_Left ? clamp_rect.Max.x : +FLT_MAX, border_n == ImGuiDir_Up ? clamp_rect.Max.y : +FLT_MAX); ImVec2 clamp_max(border_n == ImGuiDir_Left ? clamp_rect.Max.x : +FLT_MAX, border_n == ImGuiDir_Up ? clamp_rect.Max.y : +FLT_MAX);
border_target = ImClamp(border_target, clamp_min, clamp_max); border_target = ImClamp(border_target, clamp_min, clamp_max);
if (flags & ImGuiWindowFlags_ChildWindow) // Clamp resizing of childs within parent
{
ImGuiWindow* parent_window = window->ParentWindow;
ImGuiWindowFlags parent_flags = parent_window->Flags;
ImRect border_limit_rect = parent_window->InnerRect;
border_limit_rect.Expand(ImVec2(-ImMax(parent_window->WindowPadding.x, parent_window->WindowBorderSize), -ImMax(parent_window->WindowPadding.y, parent_window->WindowBorderSize)));
if ((axis == ImGuiAxis_X) && ((parent_flags & (ImGuiWindowFlags_HorizontalScrollbar | ImGuiWindowFlags_AlwaysHorizontalScrollbar)) == 0 || (parent_flags & ImGuiWindowFlags_NoScrollbar)))
border_target.x = ImClamp(border_target.x, border_limit_rect.Min.x, border_limit_rect.Max.x);
if ((axis == ImGuiAxis_Y) && (parent_flags & ImGuiWindowFlags_NoScrollbar))
border_target.y = ImClamp(border_target.y, border_limit_rect.Min.y, border_limit_rect.Max.y);
}
if (!ignore_resize) if (!ignore_resize)
CalcResizePosSizeFromAnyCorner(window, border_target, ImMin(def.SegmentN1, def.SegmentN2), &pos_target, &size_target); CalcResizePosSizeFromAnyCorner(window, border_target, ImMin(def.SegmentN1, def.SegmentN2), &pos_target, &size_target);
} }
@ -7657,7 +7657,19 @@ bool ImGui::Begin(const char* name, bool* p_open, ImGuiWindowFlags flags)
// Handle manual resize: Resize Grips, Borders, Gamepad // Handle manual resize: Resize Grips, Borders, Gamepad
int border_hovered = -1, border_held = -1; int border_hovered = -1, border_held = -1;
ImU32 resize_grip_col[4] = {}; ImU32 resize_grip_col[4] = {};
const int resize_grip_count = ((flags & ImGuiWindowFlags_ChildWindow) && !(flags & ImGuiWindowFlags_Popup)) ? 0 : g.IO.ConfigWindowsResizeFromEdges ? 2 : 1; // Allow resize from lower-left if we have the mouse cursor feedback for it. int resize_grip_count;
if ((flags & ImGuiWindowFlags_ChildWindow) && !(flags & ImGuiWindowFlags_Popup)) {
// Child windows can only be resized when they have the flags set. The resize grip allows resizing in both directions, so it should appear only if both flags are set.
if ((window->ChildFlags & ImGuiChildFlags_ResizeX) && (window->ChildFlags & ImGuiChildFlags_ResizeY)) {
resize_grip_count = 1; // Child windows can only be resized in the layout direction, that is rightwards and downwards.
}
else {
resize_grip_count = 0;
}
}
else {
resize_grip_count = g.IO.ConfigWindowsResizeFromEdges ? 2 : 1; // Allow resize from lower-left if we have the mouse cursor feedback for it.
}
const float resize_grip_draw_size = IM_TRUNC(ImMax(g.FontSize * 1.10f, window->WindowRounding + 1.0f + g.FontSize * 0.2f)); const float resize_grip_draw_size = IM_TRUNC(ImMax(g.FontSize * 1.10f, window->WindowRounding + 1.0f + g.FontSize * 0.2f));
if (handle_borders_and_resize_grips && !window->Collapsed) if (handle_borders_and_resize_grips && !window->Collapsed)
if (int auto_fit_mask = UpdateWindowManualResize(window, size_auto_fit, &border_hovered, &border_held, resize_grip_count, &resize_grip_col[0], visibility_rect)) if (int auto_fit_mask = UpdateWindowManualResize(window, size_auto_fit, &border_hovered, &border_held, resize_grip_count, &resize_grip_col[0], visibility_rect))