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Added callback functions for Grab/Release Node events handling #186

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Added callback functions for Grab/Release Node events handling #186

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47 changes: 44 additions & 3 deletions imnodes.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -823,9 +823,9 @@ ImVec2 SnapOriginToGrid(ImVec2 origin)
return origin;
}

void TranslateSelectedNodes(ImNodesEditorContext& editor)
void TranslateSelectedNodes(ImNodesEditorContext& editor, bool force)
{
if (GImNodes->LeftMouseDragging)
if (force || GImNodes->LeftMouseDragging)
{
// If we have grid snap enabled, don't start moving nodes until we've moved the mouse
// slightly
Expand Down Expand Up @@ -984,11 +984,19 @@ void ClickInteractionUpdate(ImNodesEditorContext& editor)
break;
case ImNodesClickInteractionType_Node:
{
TranslateSelectedNodes(editor);
if (!editor.NodeDraggingEnableStateOnce)
{
IM_ASSERT(GImNodes->HoveredNodeIdx.HasValue());
editor.NodeDraggingEnableStateOnce = true;
editor.NodeDraggingState = 1;
}

TranslateSelectedNodes(editor, false);

if (GImNodes->LeftMouseReleased)
{
editor.ClickInteraction.Type = ImNodesClickInteractionType_None;
editor.NodeDraggingEnableStateOnce = false;
}
}
break;
Expand Down Expand Up @@ -2244,6 +2252,11 @@ void BeginNodeEditor()

GImNodes->ActiveAttribute = false;

if (editor.ClickInteraction.Type == ImNodesClickInteractionType_Node && GImNodes->LeftMouseReleased)
{
editor.NodeDraggingState = 2;
}

ImGui::BeginGroup();
{
ImGui::PushStyleVar(ImGuiStyleVar_FramePadding, ImVec2(1.f, 1.f));
Expand Down Expand Up @@ -2282,6 +2295,8 @@ void EndNodeEditor()

ImNodesEditorContext& editor = EditorContextGet();

editor.NodeDraggingState = 0;

bool no_grid_content = editor.GridContentBounds.IsInverted();
if (no_grid_content)
{
Expand Down Expand Up @@ -2955,6 +2970,32 @@ bool IsAnyAttributeActive(int* const attribute_id)
return true;
}

bool IsNodesDragStarted(int *num_selected_nodes)
{
ImNodesEditorContext &editor = *GImNodes->EditorCtx;

if (editor.NodeDraggingState == 1)
{
*num_selected_nodes = editor.SelectedNodeIndices.size();
return true;
}

return false;
}

bool IsNodesDragStopped(int *num_selected_nodes)
{
ImNodesEditorContext &editor = *GImNodes->EditorCtx;

if (editor.NodeDraggingState == 2)
{
*num_selected_nodes = editor.SelectedNodeIndices.size();
TranslateSelectedNodes(editor, true);
return true;
}
return false;
}

bool IsLinkStarted(int* const started_at_id)
{
// Call this function after EndNodeEditor()!
Expand Down
5 changes: 5 additions & 0 deletions imnodes.h
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Original file line number Diff line number Diff line change
Expand Up @@ -394,6 +394,11 @@ bool IsAnyAttributeActive(int* attribute_id = NULL);
// Use the following functions to query a change of state for an existing link, or new link. Call
// these after EndNodeEditor().

// Returns true if the user just started dragging a node
bool IsNodesDragStarted(int *num_selected_nodes);
// Returns true if the user just stopped (released) the node after dragging it
bool IsNodesDragStopped(int *num_selected_nodes);

// Did the user start dragging a new link from a pin?
bool IsLinkStarted(int* started_at_attribute_id);
// Did the user drop the dragged link before attaching it to a pin?
Expand Down
4 changes: 3 additions & 1 deletion imnodes_internal.h
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Original file line number Diff line number Diff line change
Expand Up @@ -267,6 +267,8 @@ struct ImNodesEditorContext
ImVec2 PrimaryNodeOffset;

ImClickInteractionState ClickInteraction;
int NodeDraggingState; // 0 - None, 1 - Just started dragging, 2 - Just stopped dragging
bool NodeDraggingEnableStateOnce; // Used as a flag that ensures state value change for a single frame

// Mini-map state set by MiniMap()

Expand All @@ -284,7 +286,7 @@ struct ImNodesEditorContext

ImNodesEditorContext()
: Nodes(), Pins(), Links(), Panning(0.f, 0.f), SelectedNodeIndices(), SelectedLinkIndices(),
SelectedNodeOffsets(), PrimaryNodeOffset(0.f, 0.f), ClickInteraction(),
SelectedNodeOffsets(), PrimaryNodeOffset(0.f, 0.f), ClickInteraction(), NodeDraggingState(0), NodeDraggingEnableStateOnce(false),
MiniMapEnabled(false), MiniMapSizeFraction(0.0f),
MiniMapNodeHoveringCallback(NULL), MiniMapNodeHoveringCallbackUserData(NULL),
MiniMapScaling(0.0f)
Expand Down