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Docking: Fix honoring payload filter with overlapping nodes. (we incorrectly over-relied on g.HoveredDockNode when making change for #3398)

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Essentially undo part of 85a661d (#3398) + ref cf31254 (#3420)
This commit is contained in:
ocornut 2020-08-25 19:03:08 +02:00
parent 831e2c920e
commit 30f0900b1c
2 changed files with 20 additions and 12 deletions
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30
imgui.cpp
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@ -14890,18 +14890,26 @@ void ImGui::BeginDockableDragDropTarget(ImGuiWindow* window)
if (AcceptDragDropPayload(IMGUI_PAYLOAD_TYPE_WINDOW, ImGuiDragDropFlags_AcceptBeforeDelivery | ImGuiDragDropFlags_AcceptNoDrawDefaultRect))
{
// Select target node
// (we should not assume that g.HoveredDockNode is != NULL when window is a host dock node: it depends on padding/spacing handled by DockNodeTreeFindVisibleNodeByPos)
ImGuiDockNode* node = g.HoveredDockNode;
const bool allow_null_target_node = window->DockNode == NULL && window->DockNodeAsHost == NULL;
// There is an edge case when docking into a dockspace which only has inactive nodes (because none of the windows are active)
// In this case we need to fallback into any leaf mode, possibly the central node.
if (window->DockNodeAsHost && node && node->IsDockSpace() && node->IsRootNode())
// (Important: we cannot use g.HoveredDockNode here! Because each of our target node have filters based on payload, each candidate drop target will do its own evaluation)
bool dock_into_floating_window = false;
ImGuiDockNode* node = NULL;
if (window->DockNodeAsHost)
{
if (node->CentralNode && node->IsLeafNode()) // FIXME-20181220: We should not have to test for IsLeafNode() here but we have another bug to fix first.
node = node->CentralNode;
// Cannot assume that node will != NULL even though we passed the rectangle test: it depends on padding/spacing handled by DockNodeTreeFindVisibleNodeByPos().
node = DockNodeTreeFindVisibleNodeByPos(window->DockNodeAsHost, g.IO.MousePos);
// There is an edge case when docking into a dockspace which only has _inactive_ nodes (because none of the windows are active)
// In this case we need to fallback into any leaf mode, possibly the central node.
// FIXME-20181220: We should not have to test for IsLeafNode() here but we have another bug to fix first.
if (node && node->IsDockSpace() && node->IsRootNode())
node = (node->CentralNode && node->IsLeafNode()) ? node->CentralNode : DockNodeTreeFindFallbackLeafNode(node);
}
else
{
if (window->DockNode)
node = window->DockNode;
else
node = DockNodeTreeFindFallbackLeafNode(node);
dock_into_floating_window = true; // Dock into a regular window
}
const ImRect explicit_target_rect = (node && node->TabBar && !node->IsHiddenTabBar() && !node->IsNoTabBar()) ? node->TabBar->BarRect : ImRect(window->Pos, window->Pos + ImVec2(window->Size.x, GetFrameHeight()));
@ -14910,7 +14918,7 @@ void ImGui::BeginDockableDragDropTarget(ImGuiWindow* window)
// Preview docking request and find out split direction/ratio
//const bool do_preview = true; // Ignore testing for payload->IsPreview() which removes one frame of delay, but breaks overlapping drop targets within the same window.
const bool do_preview = payload->IsPreview() || payload->IsDelivery();
if (do_preview && (node != NULL || allow_null_target_node))
if (do_preview && (node != NULL || dock_into_floating_window))
{
ImGuiDockPreviewData split_inner;
ImGuiDockPreviewData split_outer;

2
imgui_internal.h
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@ -1296,7 +1296,7 @@ struct ImGuiContext
ImGuiWindow* HoveredWindow; // Window the mouse is hovering. Will typically catch mouse inputs.
ImGuiWindow* HoveredRootWindow; // == HoveredWindow ? HoveredWindow->RootWindow : NULL, merely a shortcut to avoid null test in some situation.
ImGuiWindow* HoveredWindowUnderMovingWindow; // Hovered window ignoring MovingWindow. Only set if MovingWindow is set.
ImGuiDockNode* HoveredDockNode;
ImGuiDockNode* HoveredDockNode; // Hovered dock node.
ImGuiWindow* MovingWindow; // Track the window we clicked on (in order to preserve focus). The actual window that is moved is generally MovingWindow->RootWindow.
ImGuiWindow* WheelingWindow; // Track the window we started mouse-wheeling on. Until a timer elapse or mouse has moved, generally keep scrolling the same window even if during the course of scrolling the mouse ends up hovering a child window.
ImVec2 WheelingWindowRefMousePos;