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Drag and Drop: Moved internal fields out of public sight. (#143)

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This commit is contained in:
omar 2017-11-06 20:02:56 +01:00
parent 8b725c94cb
commit de1e7dc088
3 changed files with 25 additions and 18 deletions
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33
imgui.cpp
View File

@ -662,6 +662,7 @@ static bool DataTypeApplyOpFromText(const char* buf, const char* ini
namespace ImGui
{
static void ClearDragDrop();
static void FocusPreviousWindow();
}
@ -2250,15 +2251,14 @@ 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;
g.DragDropPayload.Clear();
ClearDragDrop();
g.DragDropPayloadBufHeap.clear();
memset(&g.DragDropPayloadBufLocal, 0, sizeof(g.DragDropPayloadBufLocal));
}
g.DragDropAcceptIdPrev = g.DragDropAcceptIdCurr;
g.DragDropAcceptIdCurr = 0;
// Update keyboard input state
memcpy(g.IO.KeysDownDurationPrev, g.IO.KeysDownDuration, sizeof(g.IO.KeysDownDuration));
@ -10631,6 +10631,15 @@ void ImGui::Value(const char* prefix, float v, const char* float_format)
// DRAG AND DROP
//-----------------------------------------------------------------------------
static void ImGui::ClearDragDrop()
{
ImGuiContext& g = *GImGui;
g.DragDropActive = false;
g.DragDropPayload.Clear();
g.DragDropAcceptIdCurr = g.DragDropAcceptIdPrev = 0;
g.DragDropAcceptFrameCount = -1;
}
// Call when current ID is active.
// When this returns true you need to: a) call SetDragDropPayload() exactly once, b) you may render the payload visual/description, c) call EndDragDropSource()
bool ImGui::BeginDragDropSource(ImGuiDragDropFlags flags, int mouse_button)
@ -10677,8 +10686,8 @@ bool ImGui::BeginDragDropSource(ImGuiDragDropFlags flags, int mouse_button)
if (!g.DragDropActive)
{
IM_ASSERT(id != 0);
ClearDragDrop();
ImGuiPayload& payload = g.DragDropPayload;
payload.Clear();
payload.SourceId = id;
payload.SourceParentId = window->IDStack.back();
g.DragDropActive = true;
@ -10718,10 +10727,7 @@ void ImGui::EndDragDropSource()
// Discard the drag if have not called SetDragDropPayload()
if (g.DragDropPayload.DataFrameCount == -1)
{
g.DragDropActive = false;
g.DragDropPayload.Clear();
}
ClearDragDrop();
}
// Use 'cond' to choose to submit payload on drag start or every frame
@ -10765,7 +10771,7 @@ bool ImGui::SetDragDropPayload(const char* type, const void* data, size_t data_s
}
payload.DataFrameCount = g.FrameCount;
return (payload.AcceptFrameCount == g.FrameCount) || (payload.AcceptFrameCount == g.FrameCount - 1);
return (g.DragDropAcceptFrameCount == g.FrameCount) || (g.DragDropAcceptFrameCount == g.FrameCount - 1);
}
bool ImGui::BeginDragDropTarget()
@ -10795,9 +10801,8 @@ const ImGuiPayload* ImGui::AcceptDragDropPayload(const char* type, ImGuiDragDrop
return NULL;
// 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;
const bool was_accepted_previously = (g.DragDropAcceptIdPrev == window->DC.LastItemId);
g.DragDropAcceptIdCurr = window->DC.LastItemId;
// Render drop visuals
if (!(flags & ImGuiDragDropFlags_AcceptNoDrawDefaultRect) && was_accepted_previously)
@ -10807,7 +10812,7 @@ const ImGuiPayload* ImGui::AcceptDragDropPayload(const char* type, ImGuiDragDrop
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;
g.DragDropAcceptFrameCount = g.FrameCount;
payload.Delivery = was_accepted_previously && IsMouseReleased(g.DragDropMouseButton);
if (!payload.Delivery && !(flags & ImGuiDragDropFlags_AcceptBeforeDelivery))
return NULL;

5
imgui.h
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@ -1153,15 +1153,12 @@ struct ImGuiPayload
// [Internal]
ImGuiID SourceId; // Source item id
ImGuiID SourceParentId; // Source parent id (if available)
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 = AcceptIdCurr = AcceptIdPrev = 0; AcceptFrameCount = -1; Data = NULL; DataSize = 0; memset(DataType, 0, sizeof(DataType)); DataFrameCount = -1; Delivery = false; }
void Clear() { SourceId = SourceParentId = 0; 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; }
};

5
imgui_internal.h
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@ -480,6 +480,9 @@ struct ImGuiContext
ImGuiDragDropFlags DragDropSourceFlags;
int DragDropMouseButton;
ImGuiPayload DragDropPayload;
ImGuiID DragDropAcceptIdCurr; // Target item id (set at the time of accepting the payload)
ImGuiID DragDropAcceptIdPrev; // Target item id from previous frame (we need to store this to allow for overlapping drag and drop targets)
int DragDropAcceptFrameCount; // Last time a target expressed a desire to accept the source
ImVector<unsigned char> DragDropPayloadBufHeap; // We don't expose the ImVector<> directly
unsigned char DragDropPayloadBufLocal[8];
@ -563,6 +566,8 @@ struct ImGuiContext
DragDropActive = false;
DragDropSourceFlags = 0;
DragDropMouseButton = -1;
DragDropAcceptIdPrev = DragDropAcceptIdCurr = 0;
DragDropAcceptFrameCount = -1;
memset(DragDropPayloadBufLocal, 0, sizeof(DragDropPayloadBufLocal));
ScalarAsInputTextId = 0;