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MultiSelect: Comments. Tweak demo.

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omar 2020-04-01 20:14:51 +02:00 • committed by ocornut
parent 9aeebd24f7
commit 0479b188d0
3 changed files with 40 additions and 30 deletions
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27
imgui_demo.cpp
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@ -2771,12 +2771,15 @@ static void ShowDemoWindowWidgets()
// 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
// About RefItem:
// - The MultiSelect API requires you to store information about the reference/pivot item (generally the last clicked item).
struct ExampleSelection
{
ImGuiStorage Storage;
int SelectionSize; // Number of selected items (== number of 1 in the Storage)
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)
ExampleSelectionData() { Clear(); }
ExampleSelection() { RangeRef = 0; Clear(); }
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; }
@ -2837,8 +2840,7 @@ static void ShowDemoWindowMultiSelect()
if (ImGui::TreeNode("Multiple Selection (Full)"))
{
// Demonstrate holding/updating multi-selection data and using the BeginMultiSelect/EndMultiSelect API to support range-selection and clipping.
static int selection_ref = 0; // Selection pivot (last clicked item, we need to preserve this to handle range-select)
static ExampleSelectionData selection;
static ExampleSelection selection;
const char* random_names[] =
{
"Artichoke", "Arugula", "Asparagus", "Avocado", "Bamboo Shoots", "Bean Sprouts", "Beans", "Beet", "Belgian Endive", "Bell Pepper",
@ -2866,7 +2868,7 @@ static void ShowDemoWindowMultiSelect()
if (widget_type == WidgetType_TreeNode)
ImGui::PushStyleVar(ImGuiStyleVar_ItemSpacing, ImVec2(ImGui::GetStyle().ItemSpacing.x, 0.0f));
ImGuiMultiSelectData* multi_select_data = ImGui::BeginMultiSelect(ImGuiMultiSelectFlags_None, (void*)(intptr_t)selection_ref, selection.GetSelected(selection_ref));
ImGuiMultiSelectData* multi_select_data = ImGui::BeginMultiSelect(ImGuiMultiSelectFlags_None, (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); }
@ -2880,7 +2882,7 @@ static void ShowDemoWindowMultiSelect()
clipper.Begin(ITEMS_COUNT);
while (clipper.Step())
{
if (clipper.DisplayStart > (int)selection_ref)
if (clipper.DisplayStart > selection.RangeRef)
multi_select_data->RangeSrcPassedBy = true;
for (int n = clipper.DisplayStart; n < clipper.DisplayEnd; n++)
{
@ -2904,12 +2906,15 @@ static void ShowDemoWindowMultiSelect()
}
else if (widget_type == WidgetType_TreeNode)
{
ImGuiTreeNodeFlags tree_node_flags = ImGuiTreeNodeFlags_NoTreePushOnOpen | ImGuiTreeNodeFlags_SpanAvailWidth | ImGuiTreeNodeFlags_OpenOnDoubleClick;
ImGuiTreeNodeFlags tree_node_flags = ImGuiTreeNodeFlags_SpanAvailWidth;
tree_node_flags |= ImGuiTreeNodeFlags_OpenOnArrow | ImGuiTreeNodeFlags_OpenOnDoubleClick;
if (item_is_selected)
tree_node_flags |= ImGuiTreeNodeFlags_Selected;
ImGui::TreeNodeEx(label, tree_node_flags);
bool open = ImGui::TreeNodeEx(label, tree_node_flags);
if (ImGui::IsItemToggledSelection())
selection.SetSelected(n, !item_is_selected);
if (open)
ImGui::TreePop();
}
if (use_columns)
@ -2917,7 +2922,7 @@ static void ShowDemoWindowMultiSelect()
ImGui::NextColumn();
ImGui::SetNextItemWidth(-FLT_MIN);
ImGui::PushStyleVar(ImGuiStyleVar_FramePadding, ImVec2(0, 0));
ImGui::InputText("###NoLabel", (char*)category, strlen(category), ImGuiInputTextFlags_ReadOnly);
ImGui::InputText("###NoLabel", (char*)(void*)category, strlen(category), ImGuiInputTextFlags_ReadOnly);
ImGui::PopStyleVar();
ImGui::NextColumn();
}
@ -2931,7 +2936,7 @@ static void ShowDemoWindowMultiSelect()
// Apply multi-select requests
multi_select_data = ImGui::EndMultiSelect();
selection_ref = (int)(intptr_t)multi_select_data->RangeSrc;
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); }