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Demo: Assets Browser: add hit spacing, requierd for box-select patterns.

This commit is contained in:
ocornut 2023-09-25 17:21:19 +02:00
parent 3d41994a63
commit bf01795483
1 changed files with 21 additions and 5 deletions
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26
imgui_demo.cpp
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@ -3456,7 +3456,8 @@ static void ShowDemoWindowMultiSelect()
// Drag and Drop
if (use_drag_drop && ImGui::BeginDragDropSource())
{
// Write payload with full selection OR single unselected item (only possible with ImGuiMultiSelectFlags_SelectOnClickRelease)
// Consider payload to be full selection OR single unselected item.
// (the later is only possible when using ImGuiMultiSelectFlags_SelectOnClickRelease)
if (ImGui::GetDragDropPayload() == NULL)
{
ImVector<int> payload_items;
@ -9690,8 +9691,10 @@ struct ExampleAssetsBrowser
{
// Options
bool ShowTypeOverlay = true;
bool AllowDragUnselected = false;
float IconSize = 32.0f;
int IconSpacing = 7;
int IconSpacing = 10;
int IconHitSpacing = 4; // Increase hit-spacing if you want to make it possible to clear or box-select from gaps. Some spacing is required to able to amend with Shift+box-select. Value is small in Explorer.
bool StretchSpacing = true;
// State
@ -9751,9 +9754,13 @@ struct ExampleAssetsBrowser
ImGui::SeparatorText("Contents");
ImGui::Checkbox("Show Type Overlay", &ShowTypeOverlay);
ImGui::SeparatorText("Selection Behavior");
ImGui::Checkbox("Allow dragging unselected item", &AllowDragUnselected);
ImGui::SeparatorText("Layout");
ImGui::SliderFloat("Icon Size", &IconSize, 16.0f, 128.0f, "%.0f");
ImGui::SliderInt("Icon Spacing", &IconSpacing, 0, 32);
ImGui::SliderInt("Icon Hit Spacing", &IconHitSpacing, 0, 32);
ImGui::Checkbox("Stretch Spacing", &StretchSpacing);
ImGui::PopItemWidth();
ImGui::EndMenu();
@ -9820,6 +9827,9 @@ struct ExampleAssetsBrowser
// Multi-select
ImGuiMultiSelectFlags ms_flags = ImGuiMultiSelectFlags_ClearOnEscape | ImGuiMultiSelectFlags_ClearOnClickWindowVoid;
if (AllowDragUnselected)
ms_flags |= ImGuiMultiSelectFlags_SelectOnClickRelease; // To allow dragging an unselected item without altering selection.
ImGuiMultiSelectIO* ms_io = ImGui::BeginMultiSelect(ms_flags);
ExampleSelectionAdapter selection_adapter;
selection_adapter.Data = this;
@ -9830,7 +9840,8 @@ struct ExampleAssetsBrowser
// But it is necessary for two reasons:
// - Selectables uses it by default to visually fill the space between two items.
// - The vertical spacing would be measured by Clipper to calculate line height if we didn't provide it explicitly (here we do).
ImGui::PushStyleVar(ImGuiStyleVar_ItemSpacing, ImVec2(item_spacing, item_spacing));
const float selectable_spacing = IM_MAX(floorf(item_spacing) - IconHitSpacing, 0.0f);
ImGui::PushStyleVar(ImGuiStyleVar_ItemSpacing, ImVec2(selectable_spacing, selectable_spacing));
// Rendering parameters
const ImU32 icon_bg_color = IM_COL32(48, 48, 48, 128);
@ -9875,8 +9886,13 @@ struct ExampleAssetsBrowser
// Drag and drop
if (ImGui::BeginDragDropSource())
{
ImGui::SetDragDropPayload("ASSETS_BROWSER_ITEMS", "Dummy", 5);
ImGui::Text("%d assets", Selection.Size);
// Consider payload to be full selection OR single unselected item
// (the later is only possible when using ImGuiMultiSelectFlags_SelectOnClickRelease)
int payload_size = item_is_selected ? Selection.Size : 1;
if (ImGui::GetDragDropPayload() == NULL)
ImGui::SetDragDropPayload("ASSETS_BROWSER_ITEMS", "Dummy", 5); // Dummy payload
ImGui::Text("%d assets", payload_size);
ImGui::EndDragDropSource();
}