Windows can be resized from their borders when ImGuiWindowFlags_ResizeFromAnySide is set. (#822) The interaction is currently unsatisfying because we can only reach a window from its inner rectangle (because of HoveredWindow filtering).
diff --git a/imgui.cpp b/imgui.cpp
index 5d95827..c02e292 100644
--- a/imgui.cpp
+++ b/imgui.cpp
@@ -4227,6 +4227,18 @@
{ ImVec2(1,0), ImVec2(-1,+1), 9,12 }, // Upper right
};
+static ImRect GetBorderRect(ImGuiWindow* window, int border_n, float perp_padding, float thickness)
+{
+ ImRect rect = window->Rect();
+ if (thickness == 0.0f) rect.Max -= ImVec2(1,1);
+ if (border_n == 0) return ImRect(rect.Min.x + perp_padding, rect.Min.y, rect.Max.x - perp_padding, rect.Min.y + thickness);
+ if (border_n == 1) return ImRect(rect.Max.x - thickness, rect.Min.y + perp_padding, rect.Max.x, rect.Max.y - perp_padding);
+ if (border_n == 2) return ImRect(rect.Min.x + perp_padding, rect.Max.y - thickness, rect.Max.x - perp_padding, rect.Max.y);
+ if (border_n == 3) return ImRect(rect.Min.x, rect.Min.y + perp_padding, rect.Min.x + thickness, rect.Max.y - perp_padding);
+ IM_ASSERT(0);
+ return ImRect();
+}
+
// 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.
@@ -4562,9 +4574,11 @@
}
else
{
- // Handle resize for: Resize Grips, Gamepad
+ // Handle resize for: Resize Grips, Borders, Gamepad
+ int border_hovered = -1, border_held = -1;
ImU32 resize_grip_col[4] = { 0 };
const int resize_grip_count = (flags & ImGuiWindowFlags_ResizeFromAnySide) ? 2 : 1; // 4
+ const int resize_border_count = (flags & ImGuiWindowFlags_ResizeFromAnySide) ? 4 : 0;
const float grip_draw_size = (float)(int)ImMax(g.FontSize * 1.35f, window_rounding + 1.0f + g.FontSize * 0.2f);
const float grip_hover_size = (float)(int)(grip_draw_size * 0.75f);
@@ -4603,6 +4617,30 @@
}
resize_grip_col[resize_grip_n] = GetColorU32(held ? ImGuiCol_ResizeGripActive : hovered ? ImGuiCol_ResizeGripHovered : ImGuiCol_ResizeGrip);
}
+ for (int border_n = 0; border_n < resize_border_count; border_n++)
+ {
+ const float BORDER_SIZE = 5.0f; // FIXME: Only works _inside_ window because of HoveredWindow check.
+ const float BORDER_APPEAR_TIMER = 0.05f; // Reduce visual noise
+ bool hovered, held;
+ ImRect border_rect = GetBorderRect(window, border_n, grip_hover_size, BORDER_SIZE);
+ ButtonBehavior(border_rect, window->GetID((void*)(border_n+4)), &hovered, &held, ImGuiButtonFlags_FlattenChilds);
+ if ((hovered && g.HoveredIdTimer > BORDER_APPEAR_TIMER) || (held && g.ActiveIdTimer > BORDER_APPEAR_TIMER))
+ {
+ g.MouseCursor = (border_n & 1) ? ImGuiMouseCursor_ResizeEW : ImGuiMouseCursor_ResizeNS;
+ if (hovered) border_hovered = border_n;
+ if (held) border_held = border_n;
+ }
+ if (held)
+ {
+ ImVec2 border_target = window->Pos;
+ ImVec2 border_posn;
+ if (border_n == 0) { border_posn = ImVec2(0, 0); border_target.y = (g.IO.MousePos.y - g.ActiveIdClickOffset.y); }
+ if (border_n == 1) { border_posn = ImVec2(1, 0); border_target.x = (g.IO.MousePos.x - g.ActiveIdClickOffset.x + BORDER_SIZE); }
+ if (border_n == 2) { border_posn = ImVec2(0, 1); border_target.y = (g.IO.MousePos.y - g.ActiveIdClickOffset.y + BORDER_SIZE); }
+ if (border_n == 3) { border_posn = ImVec2(0, 0); border_target.x = (g.IO.MousePos.x - g.ActiveIdClickOffset.x); }
+ CalcResizePosSizeFromAnyCorner(window, border_target, border_posn, &pos_target, &size_target);
+ }
+ }
PopID();
// Apply back modified position/size to window
@@ -4663,6 +4701,11 @@
// Borders
if (window_border_size > 0.0f)
window->DrawList->AddRect(window->Pos, window->Pos+window->Size, GetColorU32(ImGuiCol_Border), window_rounding, ImDrawCornerFlags_All, window_border_size);
+ if (border_held != -1 || border_hovered != -1)
+ {
+ ImRect border = GetBorderRect(window, border_held != -1 ? border_held : border_hovered, grip_draw_size, 0.0f);
+ window->DrawList->AddLine(border.Min, border.Max, GetColorU32(border_held != -1 ? ImGuiCol_SeparatorActive : ImGuiCol_SeparatorHovered), ImMax(1.0f, window_border_size));
+ }
if (style.FrameBorderSize > 0 && !(flags & ImGuiWindowFlags_NoTitleBar))
window->DrawList->AddLine(title_bar_rect.GetBL()+ImVec2(1,-1), title_bar_rect.GetBR()+ImVec2(-1,-1), GetColorU32(ImGuiCol_Border), style.FrameBorderSize);
}
