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TreeNode: Made clicking on arrow with _OpenOnArrow toggle the open state on the Mouse Down event rather than the Mouse Down+Up sequence (this is rather standard behavior).

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This commit is contained in:
omar
2020-03-31 19:29:46 +02:00
parent 68c5d030cd
commit 05420ea2cf
2 changed files with 26 additions and 15 deletions
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39
imgui_widgets.cpp
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@ -5319,30 +5319,39 @@ bool ImGui::TreeNodeBehavior(ImGuiID id, ImGuiTreeNodeFlags flags, const char* l
return is_open;
}
// Flags that affects opening behavior:
// - 0 (default) .................... single-click anywhere to open
// - OpenOnDoubleClick .............. double-click anywhere to open
// - OpenOnArrow .................... single-click on arrow to open
// - OpenOnDoubleClick|OpenOnArrow .. single-click on arrow or double-click anywhere to open
ImGuiButtonFlags button_flags = 0;
ImGuiButtonFlags button_flags = ImGuiTreeNodeFlags_None;
if (flags & ImGuiTreeNodeFlags_AllowItemOverlap)
button_flags |= ImGuiButtonFlags_AllowItemOverlap;
if (flags & ImGuiTreeNodeFlags_OpenOnDoubleClick)
button_flags |= ImGuiButtonFlags_PressedOnDoubleClick | ((flags & ImGuiTreeNodeFlags_OpenOnArrow) ? ImGuiButtonFlags_PressedOnClickRelease : 0);
else
button_flags |= ImGuiButtonFlags_PressedOnClickRelease;
if (!is_leaf)
button_flags |= ImGuiButtonFlags_PressedOnDragDropHold;
// We allow clicking on the arrow section with keyboard modifiers held, in order to easily
// allow browsing a tree while preserving selection with code implementing multi-selection patterns.
// When clicking on the rest of the tree node we always disallow keyboard modifiers.
const float hit_padding_x = style.TouchExtraPadding.x;
const float arrow_hit_x1 = (text_pos.x - text_offset_x) - hit_padding_x;
const float arrow_hit_x2 = (text_pos.x - text_offset_x) + (g.FontSize + padding.x * 2.0f) + hit_padding_x;
if (window != g.HoveredWindow || !(g.IO.MousePos.x >= arrow_hit_x1 && g.IO.MousePos.x < arrow_hit_x2))
const float arrow_hit_x1 = (text_pos.x - text_offset_x) - style.TouchExtraPadding.x;
const float arrow_hit_x2 = (text_pos.x - text_offset_x) + (g.FontSize + padding.x * 2.0f) + style.TouchExtraPadding.x;
const bool is_mouse_x_over_arrow = (g.IO.MousePos.x >= arrow_hit_x1 && g.IO.MousePos.x < arrow_hit_x2);
if (window != g.HoveredWindow || !is_mouse_x_over_arrow)
button_flags |= ImGuiButtonFlags_NoKeyModifiers;
// Open behaviors can be altered with the _OpenOnArrow and _OnOnDoubleClick flags.
// Some alteration have subtle effects (e.g. toggle on MouseUp vs MouseDown events) due to requirements for multi-selection and drag and drop support.
// - Single-click on label = Toggle on MouseUp (default)
// - Single-click on arrow = Toggle on MouseUp (when _OpenOnArrow=0)
// - Single-click on arrow = Toggle on MouseDown (when _OpenOnArrow=1)
// - Double-click on label = Toggle on MouseDoubleClick (when _OpenOnDoubleClick=1)
// - Double-click on arrow = Toggle on MouseDoubleClick (when _OpenOnDoubleClick=1 and _OpenOnArrow=0)
// This makes _OpenOnArrow have a subtle effect on _OpenOnDoubleClick: arrow click reacts on Down rather than Up.
// It is rather standard that arrow click react on Down rather than Up and we'd be tempted to make it the default
// (by removing the _OpenOnArrow test below), however this would have a perhaps surprising effect on CollapsingHeader()?
// So right now we are making this optional. May evolve later.
if (is_mouse_x_over_arrow && (flags & ImGuiTreeNodeFlags_OpenOnArrow))
button_flags |= ImGuiButtonFlags_PressedOnClick;
else if (flags & ImGuiTreeNodeFlags_OpenOnDoubleClick)
button_flags |= ImGuiButtonFlags_PressedOnDoubleClick;
else
button_flags |= ImGuiButtonFlags_PressedOnClickRelease;
bool selected = (flags & ImGuiTreeNodeFlags_Selected) != 0;
const bool was_selected = selected;
@ -5356,7 +5365,7 @@ bool ImGui::TreeNodeBehavior(ImGuiID id, ImGuiTreeNodeFlags flags, const char* l
if ((flags & (ImGuiTreeNodeFlags_OpenOnArrow | ImGuiTreeNodeFlags_OpenOnDoubleClick)) == 0 || (g.NavActivateId == id))
toggled = true;
if (flags & ImGuiTreeNodeFlags_OpenOnArrow)
toggled |= (g.IO.MousePos.x >= arrow_hit_x1 && g.IO.MousePos.x < arrow_hit_x2) && (!g.NavDisableMouseHover); // Lightweight equivalent of IsMouseHoveringRect() since ButtonBehavior() already did the job
toggled |= is_mouse_x_over_arrow && !g.NavDisableMouseHover; // Lightweight equivalent of IsMouseHoveringRect() since ButtonBehavior() already did the job
if ((flags & ImGuiTreeNodeFlags_OpenOnDoubleClick) && g.IO.MouseDoubleClicked[0])
toggled = true;
if (g.DragDropActive && is_open) // When using Drag and Drop "hold to open" we keep the node highlighted after opening, but never close it again.