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Drag and Drop: Rework internal to allow overlapping targets (#143)

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This commit is contained in:
omar 2017-11-06 19:39:23 +01:00
parent 553bdeedf7
commit 8b725c94cb
2 changed files with 19 additions and 20 deletions
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32
imgui.cpp
View File

@ -2250,6 +2250,8 @@ void ImGui::NewFrame()
g.ScalarAsInputTextId = 0;
// Elapse drag & drop payload
g.DragDropPayload.AcceptIdPrev = g.DragDropPayload.AcceptIdCurr;
g.DragDropPayload.AcceptIdCurr = 0;
if (g.DragDropActive && g.DragDropPayload.DataFrameCount + 1 < g.FrameCount)
{
g.DragDropActive = false;
@ -10773,7 +10775,6 @@ bool ImGui::BeginDragDropTarget()
return false;
ImGuiWindow* window = g.CurrentWindow;
//if (!window->DC.LastItemRectHoveredRect || (g.ActiveId == g.DragDropPayload.SourceId || g.ActiveIdPreviousFrame == g.DragDropPayload.SourceId))
if (!window->DC.LastItemRectHoveredRect || (window->DC.LastItemId && window->DC.LastItemId == g.DragDropPayload.SourceId))
return false;
if (window->RootWindow != g.HoveredWindow->RootWindow)
@ -10793,23 +10794,20 @@ const ImGuiPayload* ImGui::AcceptDragDropPayload(const char* type, ImGuiDragDrop
if (type != NULL && !payload.IsDataType(type))
return NULL;
if (payload.AcceptId == 0)
payload.AcceptId = window->DC.LastItemId;
bool was_accepted_previously = (payload.AcceptFrameCount == g.FrameCount - 1);
if (payload.AcceptFrameCount != g.FrameCount)
{
// Render drop visuals
if (!(flags & ImGuiDragDropFlags_AcceptNoDrawDefaultRect) && was_accepted_previously)
{
ImRect r = window->DC.LastItemRect;
r.Expand(4.0f);
window->DrawList->AddRectFilled(r.Min, r.Max, IM_COL32(255, 255, 0, 20), 0.0f); // FIXME-DRAG FIXME-STYLE
window->DrawList->AddRect(r.Min, r.Max, IM_COL32(255, 255, 0, 255), 0.0f, ~0, 2.0f); // FIXME-DRAG FIXME-STYLE
}
payload.AcceptFrameCount = g.FrameCount;
}
// NB: We currently accept NULL id however, overlapping targets required unique ID to function
const bool was_accepted_previously = (payload.AcceptIdPrev == window->DC.LastItemId);
//if (window->DC.LastItemId)
payload.AcceptIdCurr = window->DC.LastItemId;
// Render drop visuals
if (!(flags & ImGuiDragDropFlags_AcceptNoDrawDefaultRect) && was_accepted_previously)
{
ImRect r = window->DC.LastItemRect;
r.Expand(4.0f);
window->DrawList->AddRectFilled(r.Min, r.Max, IM_COL32(255, 255, 0, 20), 0.0f); // FIXME-DRAG FIXME-STYLE
window->DrawList->AddRect(r.Min, r.Max, IM_COL32(255, 255, 0, 255), 0.0f, ~0, 2.0f); // FIXME-DRAG FIXME-STYLE
}
payload.AcceptFrameCount = g.FrameCount;
payload.Delivery = was_accepted_previously && IsMouseReleased(g.DragDropMouseButton);
if (!payload.Delivery && !(flags & ImGuiDragDropFlags_AcceptBeforeDelivery))
return NULL;

7
imgui.h
View File

@ -587,7 +587,7 @@ enum ImGuiHoveredFlags_
ImGuiHoveredFlags_Default = 0, // Return true if directly over the item/window, not obstructed by another window, not obstructed by an active popup or modal blocking inputs under them.
ImGuiHoveredFlags_AllowWhenBlockedByPopup = 1 << 0, // Return true even if a popup window is normally blocking access to this item/window
//ImGuiHoveredFlags_AllowWhenBlockedByModal = 1 << 1, // Return true even if a modal popup window is normally blocking access to this item/window. FIXME-TODO: Unavailable yet.
ImGuiHoveredFlags_AllowWhenBlockedByActiveItem = 1 << 2, // Return true even if an active item is blocking access to this item/window
ImGuiHoveredFlags_AllowWhenBlockedByActiveItem = 1 << 2, // Return true even if an active item is blocking access to this item/window. Useful for Drag and Drop patterns.
ImGuiHoveredFlags_AllowWhenOverlapped = 1 << 3, // Return true even if the position is overlapped by another window
ImGuiHoveredFlags_FlattenChilds = 1 << 4, // Treat all child windows as the same window (for IsWindowHovered())
ImGuiHoveredFlags_RectOnly = ImGuiHoveredFlags_AllowWhenBlockedByPopup | ImGuiHoveredFlags_AllowWhenBlockedByActiveItem | ImGuiHoveredFlags_AllowWhenOverlapped
@ -1153,14 +1153,15 @@ struct ImGuiPayload
// [Internal]
ImGuiID SourceId; // Source item id
ImGuiID SourceParentId; // Source parent id (if available)
ImGuiID AcceptId; // Target item id (set at the time of accepting the payload)
ImGuiID AcceptIdCurr; // Target item id (set at the time of accepting the payload)
ImGuiID AcceptIdPrev; // Target item id from previous frame (we need to store this to allow for overlapping drag and drop targets)
int AcceptFrameCount; // Last time a target expressed a desire to accept the source
int DataFrameCount; // Data timestamp
char DataType[8 + 1]; // Data type tag (short user-supplied string)
bool Delivery; // Set when AcceptDragDropPayload() was called and the mouse button is released over the target item
ImGuiPayload() { Clear(); }
void Clear() { SourceId = SourceParentId = AcceptId = 0; AcceptFrameCount = -1; Data = NULL; DataSize = 0; memset(DataType, 0, sizeof(DataType)); DataFrameCount = -1; Delivery = false; }
void Clear() { SourceId = SourceParentId = AcceptIdCurr = AcceptIdPrev = 0; AcceptFrameCount = -1; Data = NULL; DataSize = 0; memset(DataType, 0, sizeof(DataType)); DataFrameCount = -1; Delivery = false; }
bool IsDataType(const char* type) const { return DataFrameCount != -1 && strcmp(type, DataType) == 0; }
bool IsDelivery() const { return Delivery; }
};