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RangeSelect/MultiSelect: Comments + tweaked location for widgets to test ImGuiItemFlags_IsMultiSelect to avoid misleading into thinking doing it before ItemAdd() is necessary.

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features/range_select
ocornut ago%!(EXTRA string=2 years)
parent 408e62dbfe
commit 348561f99f
2 changed files with 30 additions and 21 deletions
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  1. 4
      imgui_internal.h
  2. 47
      imgui_widgets.cpp

4
imgui_internal.h
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@ -1758,7 +1758,7 @@ struct IMGUI_API ImGuiMultiSelectTempData
ImS8 LoopRequestSetAll; // -1: no operation, 0: clear all, 1: select all.
bool IsEndIO; // Set when switching IO from BeginMultiSelect() to EndMultiSelect() state.
bool IsFocused; // Set if currently focusing the selection scope (any item of the selection). May be used if you have custom shortcut associated to selection.
bool IsSetRange; // Set by BeginMultiSelect() when using Shift+Navigation. Because scrolling may be affected we can't afford a frame of lag with Shift+Navigation.
bool IsKeyboardSetRange; // Set by BeginMultiSelect() when using Shift+Navigation. Because scrolling may be affected we can't afford a frame of lag with Shift+Navigation.
bool NavIdPassedBy;
bool RangeSrcPassedBy; // Set by the item that matches RangeSrcItem.
bool RangeDstPassedBy; // Set by the item that matches NavJustMovedToId when IsSetRange is set.
@ -1766,7 +1766,7 @@ struct IMGUI_API ImGuiMultiSelectTempData
ImGuiMultiSelectTempData() { Clear(); }
void Clear() { size_t io_sz = sizeof(IO); ClearIO(); memset((void*)(&IO + 1), 0, sizeof(*this) - io_sz); } // Zero-clear except IO as we preserve IO.Requests[] buffer allocation.
void ClearIO() { IO.Requests.resize(0); IO.RangeSrcItem = IO.NavIdItem = (ImGuiSelectionUserData)-1; IO.NavIdSelected = IO.RangeSrcReset = false; }
void ClearIO() { IO.Requests.resize(0); IO.RangeSrcItem = IO.NavIdItem = ImGuiSelectionUserData_Invalid; IO.NavIdSelected = IO.RangeSrcReset = false; }
};
// Persistent storage for multi-select (as long as selection is alive)

47
imgui_widgets.cpp
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@ -6279,7 +6279,6 @@ bool ImGui::TreeNodeBehavior(ImGuiID id, ImGuiTreeNodeFlags flags, const char* l
// Compute open and multi-select states before ItemAdd() as it clear NextItem data.
bool is_open = TreeNodeUpdateNextOpen(id, flags);
const bool is_multi_select = (g.NextItemData.ItemFlags & ImGuiItemFlags_IsMultiSelect) != 0; // Before ItemAdd()
bool item_add = ItemAdd(interact_bb, id);
g.LastItemData.StatusFlags |= ImGuiItemStatusFlags_HasDisplayRect;
g.LastItemData.DisplayRect = frame_bb;
@ -6355,6 +6354,7 @@ bool ImGui::TreeNodeBehavior(ImGuiID id, ImGuiTreeNodeFlags flags, const char* l
const bool was_selected = selected;
// Multi-selection support (header)
const bool is_multi_select = (g.LastItemData.InFlags & ImGuiItemFlags_IsMultiSelect) != 0;
if (is_multi_select)
{
// Handle multi-select + alter button flags for it
@ -6660,7 +6660,6 @@ bool ImGui::Selectable(const char* label, bool selected, ImGuiSelectableFlags fl
}
const bool disabled_item = (flags & ImGuiSelectableFlags_Disabled) != 0;
const bool is_multi_select = (g.NextItemData.ItemFlags & ImGuiItemFlags_IsMultiSelect) != 0; // Before ItemAdd()
const bool is_visible = ItemAdd(bb, id, NULL, disabled_item ? ImGuiItemFlags_Disabled : ImGuiItemFlags_None);
if (span_all_columns)
@ -6669,11 +6668,12 @@ bool ImGui::Selectable(const char* label, bool selected, ImGuiSelectableFlags fl
window->ClipRect.Max.x = backup_clip_rect_max_x;
}
const bool is_multi_select = (g.LastItemData.InFlags & ImGuiItemFlags_IsMultiSelect) != 0;
if (!is_visible)
{
// Extra layer of "no logic clip" for box-select support
if (!is_multi_select)
return false;
// Extra layer of "no logic clip" for box-select support
if (!g.BoxSelectState.UnclipMode || !g.BoxSelectState.UnclipRect.Overlaps(bb))
return false;
}
@ -7206,16 +7206,15 @@ ImGuiMultiSelectIO* ImGui::BeginMultiSelect(ImGuiMultiSelectFlags flags)
ms->IO.NavIdSelected = (storage->NavIdSelected == 1) ? true : false;
ms->IO.Requests.resize(0);
bool request_clear = false;
bool request_select_all = false;
// Clear when using Navigation to move within the scope
// (we compare FocusScopeId so it possible to use multiple selections inside a same window)
bool request_clear = false;
bool request_select_all = false;
if (g.NavJustMovedToId != 0 && g.NavJustMovedToFocusScopeId == ms->FocusScopeId && g.NavJustMovedToHasSelectionData)
{
if (ms->KeyMods & ImGuiMod_Shift)
ms->IsSetRange = true;
if (ms->IsSetRange)
ms->IsKeyboardSetRange = true;
if (ms->IsKeyboardSetRange)
IM_ASSERT(storage->RangeSrcItem != ImGuiSelectionUserData_Invalid); // Not ready -> could clear?
if ((ms->KeyMods & (ImGuiMod_Ctrl | ImGuiMod_Shift)) == 0)
request_clear = true;
@ -7254,7 +7253,7 @@ ImGuiMultiSelectIO* ImGui::BeginMultiSelect(ImGuiMultiSelectFlags flags)
if (request_clear || request_select_all)
{
ImGuiSelectionRequest req = { ImGuiSelectionRequestType_SetAll, request_select_all, (ImGuiSelectionUserData)-1, (ImGuiSelectionUserData)-1 };
ImGuiSelectionRequest req = { ImGuiSelectionRequestType_SetAll, request_select_all, ImGuiSelectionUserData_Invalid, ImGuiSelectionUserData_Invalid };
ms->IO.Requests.push_back(req);
}
ms->LoopRequestSetAll = request_select_all ? 1 : request_clear ? 0 : -1;
@ -7322,7 +7321,7 @@ ImGuiMultiSelectIO* ImGui::EndMultiSelect()
if (ms->Flags & ImGuiMultiSelectFlags_ClearOnClickVoid)
if (IsMouseReleased(0) && IsMouseDragPastThreshold(0) == false && g.IO.KeyMods == ImGuiMod_None)
{
ImGuiSelectionRequest req = { ImGuiSelectionRequestType_SetAll, false, (ImGuiSelectionUserData)-1, (ImGuiSelectionUserData)-1 };
ImGuiSelectionRequest req = { ImGuiSelectionRequestType_SetAll, false, ImGuiSelectionUserData_Invalid, ImGuiSelectionUserData_Invalid };
ms->IO.Requests.resize(0);
ms->IO.Requests.push_back(req);
}
@ -7363,6 +7362,10 @@ void ImGui::SetNextItemSelectionUserData(ImGuiSelectionUserData selection_user_d
}
}
// In charge of:
// - Applying SetAll for submitted items.
// - Applying SetRange for submitted items and record end points.
// - Altering button behavior flags to facilitate use with drag and drop.
void ImGui::MultiSelectItemHeader(ImGuiID id, bool* p_selected, ImGuiButtonFlags* p_button_flags)
{
ImGuiContext& g = *GImGui;
@ -7383,18 +7386,16 @@ void ImGui::MultiSelectItemHeader(ImGuiID id, bool* p_selected, ImGuiButtonFlags
// When using SHIFT+Nav: because it can incur scrolling we cannot afford a frame of lag with the selection highlight (otherwise scrolling would happen before selection)
// For this to work, we need someone to set 'RangeSrcPassedBy = true' at some point (either clipper either SetNextItemSelectionUserData() function)
if (ms->IsSetRange)
if (ms->IsKeyboardSetRange)
{
IM_ASSERT(id != 0 && (ms->KeyMods & ImGuiMod_Shift) != 0);
const bool is_range_dst = (ms->RangeDstPassedBy == false) && g.NavJustMovedToId == id; // Assume that g.NavJustMovedToId is not clipped.
if (is_range_dst)
{
ms->RangeDstPassedBy = true;
if (storage->RangeSrcItem == ImGuiSelectionUserData_Invalid) // If we don't have RangeSrc, assign RangeSrc = RangeDst
{
storage->RangeSrcItem = item_data;
storage->RangeSelected = selected ? 1 : 0;
}
if (is_range_dst && storage->RangeSrcItem == ImGuiSelectionUserData_Invalid) // If we don't have RangeSrc, assign RangeSrc = RangeDst
{
storage->RangeSrcItem = item_data;
storage->RangeSelected = selected ? 1 : 0;
}
const bool is_range_src = storage->RangeSrcItem == item_data;
if (is_range_src || is_range_dst || ms->RangeSrcPassedBy != ms->RangeDstPassedBy)
@ -7420,6 +7421,13 @@ void ImGui::MultiSelectItemHeader(ImGuiID id, bool* p_selected, ImGuiButtonFlags
*p_button_flags = button_flags;
}
// In charge of:
// - Auto-select on navigation.
// - Box-select toggle handling.
// - Right-click handling.
// - Altering selection based on Ctrl/Shift modifiers, both for keyboard and mouse.
// - Record current selection state for RangeSrc
// This is all rather complex, best to run and refer to "widgets_multiselect_xxx" tests in imgui_test_suite.
void ImGui::MultiSelectItemFooter(ImGuiID id, bool* p_selected, bool* p_pressed)
{
ImGuiContext& g = *GImGui;
@ -7440,7 +7448,8 @@ void ImGui::MultiSelectItemFooter(ImGuiID id, bool* p_selected, bool* p_pressed)
ImGuiSelectionUserData item_data = g.NextItemData.SelectionUserData;
const bool is_singleselect = (ms->Flags & ImGuiMultiSelectFlags_SingleSelect) != 0;
ImGuiMultiSelectFlags flags = ms->Flags;
const bool is_singleselect = (flags & ImGuiMultiSelectFlags_SingleSelect) != 0;
bool is_ctrl = (ms->KeyMods & ImGuiMod_Ctrl) != 0;
bool is_shift = (ms->KeyMods & ImGuiMod_Shift) != 0;
@ -7506,7 +7515,7 @@ void ImGui::MultiSelectItemFooter(ImGuiID id, bool* p_selected, bool* p_pressed)
{
// Box-select
ImGuiInputSource input_source = (g.NavJustMovedToId == id || g.NavActivateId == id) ? g.NavInputSource : ImGuiInputSource_Mouse;
if (ms->Flags & ImGuiMultiSelectFlags_BoxSelect)
if (flags & ImGuiMultiSelectFlags_BoxSelect)
if (selected == false && !g.BoxSelectState.IsActive && !g.BoxSelectState.IsStarting && input_source == ImGuiInputSource_Mouse && g.IO.MouseClickedCount[0] == 1)
BoxSelectStartDrag(ms->BoxSelectId, item_data);

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