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Internals: Added BeginDragDropTooltip() internal function to convey semantic (drag and drop tooltip doesn't get clipped within display boundaries). Revert part of 3218666fb9. (#1739, #143).

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This commit is contained in:
omar
2018-05-28 21:34:32 +02:00
parent 3218666fb9
commit d4b151076c
3 changed files with 24 additions and 6 deletions
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25
imgui.cpp
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@ -13230,11 +13230,9 @@ bool ImGui::BeginDragDropSource(ImGuiDragDropFlags flags)
if (!(flags & ImGuiDragDropFlags_SourceNoPreviewTooltip))
{
SetNextWindowBgAlpha(g.Style.Colors[ImGuiCol_PopupBg].w * 0.60f);
BeginTooltipEx(0, true);
// Target can request the Source to not display its tooltip (we use a dedicated flag to make this request explicit)
// We unfortunately can't just modify the source flags and skip the call to BeginTooltip, as caller may be emitting contents.
BeginDragDropTooltip();
if (g.DragDropActive && g.DragDropAcceptIdPrev && (g.DragDropAcceptFlags & ImGuiDragDropFlags_AcceptNoPreviewTooltip))
{
ImGuiWindow* tooltip_window = g.CurrentWindow;
@ -13257,13 +13255,32 @@ void ImGui::EndDragDropSource()
IM_ASSERT(g.DragDropActive);
if (!(g.DragDropSourceFlags & ImGuiDragDropFlags_SourceNoPreviewTooltip))
EndTooltip();
EndDragDropTooltip();
// Discard the drag if have not called SetDragDropPayload()
if (g.DragDropPayload.DataFrameCount == -1)
ClearDragDrop();
}
void ImGui::BeginDragDropTooltip()
{
// The default tooltip position is a little offset to give space to see the context menu (it's also clamped within the current viewport/monitor)
// In the context of a dragging tooltip we try to reduce that offset and we enforce following the cursor.
// Whatever we do we want to call SetNextWindowPos() to enforce a tooltip position and disable clipping the tooltip without our display area, like regular tooltip do.
ImGuiContext& g = *GImGui;
//ImVec2 tooltip_pos = g.IO.MousePos - g.ActiveIdClickOffset - g.Style.WindowPadding;
ImVec2 tooltip_pos = g.IO.MousePos + ImVec2(16 * g.Style.MouseCursorScale, 8 * g.Style.MouseCursorScale);
SetNextWindowPos(tooltip_pos);
SetNextWindowBgAlpha(g.Style.Colors[ImGuiCol_PopupBg].w * 0.60f);
//PushStyleVar(ImGuiStyleVar_Alpha, g.Style.Alpha * 0.60f); // This would be nice but e.g ColorButton with checkboard has issue with transparent colors :(
BeginTooltipEx(0, true);
}
void ImGui::EndDragDropTooltip()
{
EndTooltip();
}
// Use 'cond' to choose to submit payload on drag start or every frame
bool ImGui::SetDragDropPayload(const char* type, const void* data, size_t data_size, ImGuiCond cond)
{