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MultiSelect: Fixed CTRL+A not testing focus scope id. Fixed CTRL+A not testing active id. Added demo code.

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omar 2020-03-20 12:34:52 +01:00 committed by ocornut
parent 7abda179af
commit 9aeebd24f7
2 changed files with 38 additions and 11 deletions
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43
imgui_demo.cpp
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@ -2769,26 +2769,28 @@ static void ShowDemoWindowWidgets()
// 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.)
// 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.
struct ExampleSelectionData
{
ImGuiStorage Storage;
int SelectedCount; // Number of selected items (storage will keep this updated)
int SelectionSize; // Number of selected items (== number of 1 in the Storage)
ExampleSelectionData() { Clear(); }
void Clear() { Storage.Clear(); SelectedCount = 0; }
bool GetSelected(int id) const { return Storage.GetInt((ImGuiID)id) != 0; }
void SetSelected(int id, bool v) { int* p_int = Storage.GetIntRef((ImGuiID)id); if (*p_int == (int)v) return; SelectedCount = v ? (SelectedCount + 1) : (SelectedCount - 1); *p_int = (bool)v; }
int GetSelectedCount() const { return SelectedCount; }
void Clear() { Storage.Clear(); SelectionSize = 0; }
bool GetSelected(int n) const { return Storage.GetInt((ImGuiID)n, 0) != 0; }
void SetSelected(int n, bool v) { int* p_int = Storage.GetIntRef((ImGuiID)n, 0); if (*p_int == (int)v) return; if (v) SelectionSize++; else SelectionSize--; *p_int = (bool)v; }
int GetSelectionSize() const { return SelectionSize; }
// When using SelectAll() / SetRange() we assume that our objects ID are indices.
// In this demo we always store selection using indices and never in another manner (e.g. object ID or pointers).
// If your selection system is storing selection using object ID and you want to support Shift+Click range-selection,
// 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' from/to 'ID'.
// 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 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 n = 0; n < count; n++) Storage.Data[n] = ImGuiStoragePair((ImGuiID)n, 1); SelectedCount = count; } // This could be using SetRange() but this is faster.
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.
};
static void ShowDemoWindowMultiSelect()
@ -2846,10 +2848,13 @@ static void ShowDemoWindowMultiSelect()
// Test both Selectable() and TreeNode() widgets
enum WidgetType { WidgetType_Selectable, WidgetType_TreeNode };
static bool use_columns = false;
static WidgetType widget_type = WidgetType_TreeNode;
if (ImGui::RadioButton("Selectables", widget_type == WidgetType_Selectable)) { widget_type = WidgetType_Selectable; }
ImGui::SameLine();
if (ImGui::RadioButton("Tree nodes", widget_type == WidgetType_TreeNode)) { widget_type = WidgetType_TreeNode; }
ImGui::SameLine();
ImGui::Checkbox("Use 2 columns", &use_columns);
ImGui::CheckboxFlags("io.ConfigFlags: NavEnableKeyboard", (unsigned int*)&ImGui::GetIO().ConfigFlags, ImGuiConfigFlags_NavEnableKeyboard);
ImGui::SameLine(); HelpMarker("Hold CTRL and click to select multiple items. Hold SHIFT to select a range. Keyboard is also supported.");
@ -2865,6 +2870,12 @@ static void ShowDemoWindowMultiSelect()
if (multi_select_data->RequestClear) { selection.Clear(); }
if (multi_select_data->RequestSelectAll) { selection.SelectAll(ITEMS_COUNT); }
if (use_columns)
{
ImGui::Columns(2);
//ImGui::PushStyleVar(ImGuiStyleVar_FrtemSpacing, ImVec2(ImGui::GetStyle().ItemSpacing.x, 0.0f));
}
ImGuiListClipper clipper;
clipper.Begin(ITEMS_COUNT);
while (clipper.Step())
@ -2874,8 +2885,9 @@ static void ShowDemoWindowMultiSelect()
for (int n = clipper.DisplayStart; n < clipper.DisplayEnd; n++)
{
ImGui::PushID(n);
const char* category = random_names[n % IM_ARRAYSIZE(random_names)];
char label[64];
sprintf(label, "Object %05d (category: %s)", n, random_names[n % IM_ARRAYSIZE(random_names)]);
sprintf(label, "Object %05d (category: %s)", n, category);
bool item_is_selected = selection.GetSelected(n);
// Emit a color button, to test that Shift+LeftArrow landing on an item that is not part
@ -2900,10 +2912,23 @@ static void ShowDemoWindowMultiSelect()
selection.SetSelected(n, !item_is_selected);
}
if (use_columns)
{
ImGui::NextColumn();
ImGui::SetNextItemWidth(-FLT_MIN);
ImGui::PushStyleVar(ImGuiStyleVar_FramePadding, ImVec2(0, 0));
ImGui::InputText("###NoLabel", (char*)category, strlen(category), ImGuiInputTextFlags_ReadOnly);
ImGui::PopStyleVar();
ImGui::NextColumn();
}
ImGui::PopID();
}
}
if (use_columns)
ImGui::Columns(1);
// Apply multi-select requests
multi_select_data = ImGui::EndMultiSelect();
selection_ref = (int)(intptr_t)multi_select_data->RangeSrc;

6
imgui_widgets.cpp
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@ -7153,9 +7153,11 @@ ImGuiMultiSelectData* ImGui::BeginMultiSelect(ImGuiMultiSelectFlags flags, void*
}
// Select All helper shortcut
// Note: we are comparing FocusScope so we don't need to be testing for IsWindowFocused()
if (!(flags & ImGuiMultiSelectFlags_NoMultiSelect) && !(flags & ImGuiMultiSelectFlags_NoSelectAll))
if (IsWindowFocused() && g.IO.KeyCtrl && IsKeyPressed(GetKeyIndex(ImGuiKey_A)))
ms->In.RequestSelectAll = true;
if (ms->FocusScopeId == g.NavFocusScopeId && g.ActiveId == 0)
if (g.IO.KeyCtrl && IsKeyPressed(GetKeyIndex(ImGuiKey_A)))
ms->In.RequestSelectAll = true;
#ifdef IMGUI_DEBUG_MULTISELECT
if (ms->In.RequestClear) printf("[%05d] BeginMultiSelect: RequestClear\n", g.FrameCount);