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MultiSelect: Shallow tweaks/refactors.

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Including moving IsFocused back internally for now.
This commit is contained in:
ocornut
2023-04-12 19:48:58 +02:00
parent a05700e327
commit 78cb1661cb
4 changed files with 88 additions and 90 deletions
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imgui_demo.cpp
+29 -22
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@@ -608,6 +608,7 @@ void ImGui::ShowDemoWindow(bool* p_open)
static void ShowDemoWindowWidgets()
{
IMGUI_DEMO_MARKER("Widgets");
//ImGui::SetNextItemOpen(true, ImGuiCond_Once);
if (!ImGui::CollapsingHeader("Widgets"))
return;
@@ -1353,6 +1354,7 @@ static void ShowDemoWindowWidgets()
}
IMGUI_DEMO_MARKER("Widgets/Selectables");
//ImGui::SetNextItemOpen(true, ImGuiCond_Once);
if (ImGui::TreeNode("Selectables"))
{
// Selectable() has 2 overloads:
@@ -2759,26 +2761,28 @@ static void ShowDemoWindowWidgets()
}
}
// [Advanced] Helper class to simulate storage of a multi-selection state, used by the advanced multi-selection demos.
// [Advanced] Helper class to simulate storage of a multi-selection state, used by the BeginMultiSelect() demos.
// We use ImGuiStorage (simple key->value storage) to avoid external dependencies but it's probably not optimal.
// To store a single-selection:
// - You only need a single variable and don't need any of this!
// To store a multi-selection, in your real application you could:
// - Use intrusively stored selection (e.g. 'bool IsSelected' inside your object). This is by far the simplest
// way to store your selection data, but it means you cannot have multiple simultaneous views over your objects.
// This is what may of the simpler demos in this file are using (so they are not using this class).
// - Otherwise, any externally stored unordered_set/set/hash/map/interval trees (storing indices, objects id, etc.)
// This is what many of the simpler demos in this file are using (so they are not using this class).
// - Use external storage: e.g. unordered_set/set/hash/map/interval trees (storing indices, objects id, etc.)
// are generally appropriate. Even a large array of bool might work for you...
// - If you need to handle extremely large selections, it might be advantageous to support a "negative" mode in
// your storage, so "Select All" becomes "Negative=1, Clear" and then sparse unselect can add to the storage.
// your storage, so "Select All" becomes "Negative=1 + Clear" and then sparse unselect can add to the storage.
// About RefItem:
// - The MultiSelect API requires you to store information about the reference/pivot item (generally the last clicked item).
// - The BeginMultiSelect() API requires you to store information about the reference/pivot item (generally the last clicked item).
struct ExampleSelection
{
ImGuiStorage Storage;
// Data
ImGuiStorage Storage; // Selection set
int SelectionSize; // Number of selected items (== number of 1 in the Storage, maintained by this class)
int RangeRef; // Reference/pivot item (generally last clicked item)
// Functions
ExampleSelection() { RangeRef = 0; Clear(); }
void Clear() { Storage.Clear(); SelectionSize = 0; }
bool GetSelected(int n) const { return Storage.GetInt((ImGuiID)n, 0) != 0; }
@@ -2791,11 +2795,20 @@ struct ExampleSelection
// you will need a way to iterate from one object to another given the ID you use.
// You are likely to need some kind of data structure to convert 'view index' <> 'object ID'.
// FIXME-MULTISELECT: Would be worth providing a demo of doing this.
// FIXME-MULTISELECT: SetRange() is currently very inefficient since it doesn't take advantage of the fact that ImGuiStorage stores sorted key.
void SetRange(int n1, int n2, bool v) { if (n2 < n1) { int tmp = n2; n2 = n1; n1 = tmp; } for (int n = n1; n <= n2; n++) SetSelected(n, v); }
void SelectAll(int count) { Storage.Data.resize(count); for (int idx = 0; idx < count; idx++) Storage.Data[idx] = ImGuiStoragePair((ImGuiID)idx, 1); SelectionSize = count; } // This could be using SetRange(), but it this way is faster.
// FIXME-MULTISELECT: This implementation of SetRange() is inefficient because it doesn't take advantage of the fact that ImGuiStorage stores sorted key.
void SetRange(int a, int b, bool v) { if (b < a) { int tmp = b; b = a; a = tmp; } for (int n = a; n <= b; n++) SetSelected(n, v); }
void SelectAll(int count) { Storage.Data.resize(count); for (int idx = 0; idx < count; idx++) Storage.Data[idx] = ImGuiStoragePair((ImGuiID)idx, 1); SelectionSize = count; } // This could be using SetRange(), but it this way is faster.
// Apply requests coming from BeginMultiSelect() and EndMultiSelect(). Must be done in this order! Order->SelectAll->SetRange.
void ApplyRequests(ImGuiMultiSelectData* ms_data, int items_count)
{
if (ms_data->RequestClear) { Clear(); }
if (ms_data->RequestSelectAll) { SelectAll(items_count); }
if (ms_data->RequestSetRange) { SetRange((int)(intptr_t)ms_data->RangeSrc, (int)(intptr_t)ms_data->RangeDst, ms_data->RangeValue ? 1 : 0); }
}
};
static void ShowDemoWindowMultiSelect()
{
IMGUI_DEMO_MARKER("Widgets/Selection State");
@@ -2864,8 +2877,7 @@ static void ShowDemoWindowMultiSelect()
{
ImGuiMultiSelectFlags flags = ImGuiMultiSelectFlags_ClearOnEscape;
ImGuiMultiSelectData* multi_select_data = ImGui::BeginMultiSelect(flags, (void*)(intptr_t)selection.RangeRef, selection.GetSelected(selection.RangeRef));
if (multi_select_data->RequestClear) { selection.Clear(); }
if (multi_select_data->RequestSelectAll) { selection.SelectAll(ITEMS_COUNT); }
selection.ApplyRequests(multi_select_data, ITEMS_COUNT);
for (int n = 0; n < ITEMS_COUNT; n++)
{
@@ -2886,9 +2898,7 @@ static void ShowDemoWindowMultiSelect()
// Apply multi-select requests
multi_select_data = ImGui::EndMultiSelect();
selection.RangeRef = (int)(intptr_t)multi_select_data->RangeSrc;
if (multi_select_data->RequestClear) { selection.Clear(); }
if (multi_select_data->RequestSelectAll) { selection.SelectAll(ITEMS_COUNT); }
if (multi_select_data->RequestSetRange) { selection.SetRange((int)(intptr_t)multi_select_data->RangeSrc, (int)(intptr_t)multi_select_data->RangeDst, multi_select_data->RangeValue ? 1 : 0); }
selection.ApplyRequests(multi_select_data, ITEMS_COUNT);
ImGui::EndListBox();
}
@@ -2903,7 +2913,7 @@ static void ShowDemoWindowMultiSelect()
// - Showcase having multiple multi-selection scopes in the same window.
// - Showcase using inside a table.
IMGUI_DEMO_MARKER("Widgets/Selection State/Multiple Selection (full, advanced)");
ImGui::SetNextItemOpen(true, ImGuiCond_Once);
//ImGui::SetNextItemOpen(true, ImGuiCond_Once);
if (ImGui::TreeNode("Multiple Selection (full, advanced)"))
{
// Options
@@ -2952,8 +2962,7 @@ static void ShowDemoWindowMultiSelect()
else
flags |= ImGuiMultiSelectFlags_ClearOnClickWindowVoid;
ImGuiMultiSelectData* multi_select_data = ImGui::BeginMultiSelect(flags, (void*)(intptr_t)selection->RangeRef, selection->GetSelected(selection->RangeRef));
if (multi_select_data->RequestClear) { selection->Clear(); }
if (multi_select_data->RequestSelectAll) { selection->SelectAll(ITEMS_COUNT); }
selection->ApplyRequests(multi_select_data, ITEMS_COUNT);
if (multiple_selection_scopes)
ImGui::Text("Selection size: %d", selection->GetSelectionSize()); // Draw counter below Separator and after BeginMultiSelect()
@@ -2971,8 +2980,8 @@ static void ShowDemoWindowMultiSelect()
clipper.Begin(ITEMS_COUNT);
while (clipper.Step())
{
// IF clipping is used you need to set 'RangeSrcPassedBy = true' if RangeRef was passed over.
if (clipper.DisplayStart > selection->RangeRef)
// IF clipping is used you need to set 'RangeSrcPassedBy = true' if RangeSrc was passed over.
if ((int)(intptr_t)multi_select_data->RangeSrc <= clipper.DisplayStart)
multi_select_data->RangeSrcPassedBy = true;
for (int n = clipper.DisplayStart; n < clipper.DisplayEnd; n++)
@@ -3052,9 +3061,7 @@ static void ShowDemoWindowMultiSelect()
// Apply multi-select requests
multi_select_data = ImGui::EndMultiSelect();
selection->RangeRef = (int)(intptr_t)multi_select_data->RangeSrc;
if (multi_select_data->RequestClear) { selection->Clear(); }
if (multi_select_data->RequestSelectAll) { selection->SelectAll(ITEMS_COUNT); }
if (multi_select_data->RequestSetRange) { selection->SetRange((int)(intptr_t)multi_select_data->RangeSrc, (int)(intptr_t)multi_select_data->RangeDst, multi_select_data->RangeValue ? 1 : 0); }
selection->ApplyRequests(multi_select_data, ITEMS_COUNT);
if (widget_type == WidgetType_TreeNode)
ImGui::PopStyleVar();