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MultiSelect: reworked comments in imgui.h now that we have our own section.
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imgui.h
116
imgui.h
@ -673,7 +673,7 @@ namespace ImGui
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// Multi-selection system for Selectable() and TreeNode() functions.
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// - This enables standard multi-selection/range-selection idioms (CTRL+Mouse/Keyboard, SHIFT+Mouse/Keyboard, etc.) in a way that also allow a clipper to be used.
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// - ImGuiSelectionUserData is often used to store your item index.
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// - Read comments near ImGuiMultiSelectIO for instructions/details and see 'Demo->Widgets->Selection State' for demo.
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// - Read comments near ImGuiMultiSelectIO for instructions/details and see 'Demo->Widgets->Selection State & Multi-Select' for demo.
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IMGUI_API ImGuiMultiSelectIO* BeginMultiSelect(ImGuiMultiSelectFlags flags);
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IMGUI_API ImGuiMultiSelectIO* EndMultiSelect();
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IMGUI_API void SetNextItemSelectionUserData(ImGuiSelectionUserData selection_user_data);
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@ -2726,44 +2726,22 @@ struct ImColor
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#define IMGUI_HAS_MULTI_SELECT // Multi-Select/Range-Select WIP branch // <-- This is currently _not_ in the top of imgui.h to prevent merge conflicts.
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// Flags for BeginMultiSelect().
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// (we provide 'ImGuiMultiSelectFlags_SingleSelect' for consistency and flexiblity to allow a single-selection to use same code/logic, but it essentially disable the biggest purpose of BeginMultiSelect().
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// If you use 'ImGuiMultiSelectFlags_SingleSelect' you can handle single-selection in a simpler way by just calling Selectable()/TreeNode() and reacting on clicks).
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enum ImGuiMultiSelectFlags_
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{
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ImGuiMultiSelectFlags_None = 0,
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ImGuiMultiSelectFlags_SingleSelect = 1 << 0, // Disable selecting more than one item. This is available to allow single-selection code to use same code/logic is desired, but may not be very useful.
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ImGuiMultiSelectFlags_NoSelectAll = 1 << 1, // Disable CTRL+A shortcut to set RequestSelectAll
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ImGuiMultiSelectFlags_BoxSelect = 1 << 2, // Enable box-selection. Box-selection works better with little bit of spacing between items hit-box in order to be able to aim at empty space.
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ImGuiMultiSelectFlags_NoBoxSelectScroll = 1 << 3, // Disable scrolling when box-selecting near edges of scope.
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ImGuiMultiSelectFlags_ClearOnEscape = 1 << 4, // Clear selection when pressing Escape while scope is focused.
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ImGuiMultiSelectFlags_ClearOnClickVoid = 1 << 5, // Clear selection when clicking on empty location within scope.
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ImGuiMultiSelectFlags_ScopeWindow = 1 << 6, // Scope for _ClearOnClickVoid and _BoxSelect is whole window (Default). Use if (use if BeginMultiSelect() covers a whole window.
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ImGuiMultiSelectFlags_ScopeRect = 1 << 7, // Scope for _ClearOnClickVoid and _BoxSelect is rectangle covering submitted items. Use if multiple BeginMultiSelect() are used in the same host window.
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ImGuiMultiSelectFlags_SelectOnClick = 1 << 8, // Apply selection on mouse down when clicking on unselected item. (Default)
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ImGuiMultiSelectFlags_SelectOnClickRelease = 1 << 9, // Apply selection on mouse release when clicking an unselected item. Allow dragging an unselected item without altering selection.
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};
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// Multi-selection system
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// - Refer to 'Demo->Widgets->Selection State' for references using this.
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// - Refer to 'Demo->Widgets->Selection State & Multi-Select' for references using this.
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// - This system implements standard multi-selection idioms (CTRL+Mouse/Keyboard, SHIFT+Mouse/Keyboard, etc)
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// and supports a clipper being used. Handling this manually and correctly i tricky, this is why we provide
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// and supports a clipper being used. Handling this manually and correctly is tricky, this is why we provide
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// the functionality. If you don't need SHIFT+Mouse/Keyboard range-select + clipping, you can implement a
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// simple form of multi-selection yourself, by reacting to click/presses on Selectable() items.
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// - TreeNode() and Selectable() are supported but custom widgets may use it as well.
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// - In the spirit of Dear ImGui design, your code owns actual selection data.
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// This is designed to allow all kinds of selection storage you may use in your application:
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// e.g. set/map/hash (store only selected items), instructive selection (store a bool inside each object),
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// external array (store an array in your view data, next to your objects) etc.
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// e.g. set/map/hash (store selected items), instructive selection (store a bool inside each object), etc.
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// - The work involved to deal with multi-selection differs whether you want to only submit visible items and
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// clip others, or submit all items regardless of their visibility. Clipping items is more efficient and will
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// allow you to deal with large lists (1k~100k items). See "Usage flow" section below for details.
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// If you are not sure, always start without clipping! You can work your way to the optimized version afterwards.
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// About ImGuiSelectionBasicStorage:
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// - This is an optional helper to store a selection state and apply selection requests.
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// - It is used by our demos and provided as a convenience if you want to quickly implement multi-selection.
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// About ImGuiSelectionUserData:
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// - This is your application-defined identifier in a selection set:
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// - This can store an application-defined identifier (e.g. index or pointer).
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// - For each item is it submitted by your call to SetNextItemSelectionUserData().
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// - In return we store them into RangeSrcItem/RangeFirstItem/RangeLastItem and other fields in ImGuiMultiSelectIO.
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// - Most applications will store an object INDEX, hence the chosen name and type.
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@ -2778,15 +2756,33 @@ enum ImGuiMultiSelectFlags_
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// Usage flow:
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// BEGIN - (1) Call BeginMultiSelect() and retrieve the ImGuiMultiSelectIO* result.
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// - (2) [If using clipper] Honor request list (Clear/SelectAll/SetRange requests) by updating your selection data. Same code as Step 6.
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// - (3) [If using clipper] You need to make sure RangeSrcItem is always submitted. Calculate its index and pass to clipper.IncludeIndex(). If already using indices in ImGuiSelectionUserData, it is as simple as clipper.IncludeIndex((int)ms_io->RangeSrcItem);
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// - (3) [If using clipper] You need to make sure RangeSrcItem is always submitted. Calculate its index and pass to clipper.IncludeItemByIndex(). If storing indices in ImGuiSelectionUserData, a simple clipper.IncludeItemByIndex(ms_io->RangeSrcItem) call will work.
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// LOOP - (4) Submit your items with SetNextItemSelectionUserData() + Selectable()/TreeNode() calls.
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// END - (5) Call EndMultiSelect() and retrieve the ImGuiMultiSelectIO* result.
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// - (6) Honor request list (Clear/SelectAll/SetRange requests) by updating your selection data. Same code as Step 2.
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// If you submit all items (no clipper), Step 2 and 3 and will be handled by Selectable()/TreeNode on a per-item basis.
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// However it is perfectly fine to honor all steps even if you don't use a clipper.
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// If you submit all items (no clipper), Step 2 and 3 are optional and will be handled by each item themselves. It is perfectly fine if you honor those steps without a clipper.
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// About ImGuiSelectionBasicStorage:
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// - This is an optional helper to store a selection state and apply selection requests.
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// - It is used by our demos and provided as a convenience if you want to quickly implement multi-selection.
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// Advanced:
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// - Deletion: If you need to handle items deletion: more work if needed for post-deletion focus and scrolling to be correct.
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// Refer to 'Demo->Widgets->Selection State' for demos supporting deletion.
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// Refer to 'Demo->Widgets->Selection State & Multi-Select' for demos supporting deletion.
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// Flags for BeginMultiSelect().
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enum ImGuiMultiSelectFlags_
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{
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ImGuiMultiSelectFlags_None = 0,
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ImGuiMultiSelectFlags_SingleSelect = 1 << 0, // Disable selecting more than one item. This is available to allow single-selection code to share same code/logic if desired. It essentially disables the main purpose of BeginMultiSelect() tho!
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ImGuiMultiSelectFlags_NoSelectAll = 1 << 1, // Disable CTRL+A shortcut sending a SelectAll request.
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ImGuiMultiSelectFlags_BoxSelect = 1 << 2, // Enable box-selection. Box-selection works better with little bit of spacing between items hit-box in order to be able to aim at empty space.
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ImGuiMultiSelectFlags_NoBoxSelectScroll = 1 << 3, // Disable scrolling when box-selecting near edges of scope.
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ImGuiMultiSelectFlags_ClearOnEscape = 1 << 4, // Clear selection when pressing Escape while scope is focused.
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ImGuiMultiSelectFlags_ClearOnClickVoid = 1 << 5, // Clear selection when clicking on empty location within scope.
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ImGuiMultiSelectFlags_ScopeWindow = 1 << 6, // Scope for _ClearOnClickVoid and _BoxSelect is whole window (Default). Use if BeginMultiSelect() covers a whole window.
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ImGuiMultiSelectFlags_ScopeRect = 1 << 7, // Scope for _ClearOnClickVoid and _BoxSelect is rectangle covering submitted items. Use if multiple BeginMultiSelect() are used in the same host window.
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ImGuiMultiSelectFlags_SelectOnClick = 1 << 8, // Apply selection on mouse down when clicking on unselected item. (Default)
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ImGuiMultiSelectFlags_SelectOnClickRelease = 1 << 9, // Apply selection on mouse release when clicking an unselected item. Allow dragging an unselected item without altering selection.
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};
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enum ImGuiSelectionRequestType
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{
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@ -2814,48 +2810,60 @@ struct ImGuiSelectionRequest
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struct ImGuiMultiSelectIO
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{
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//------------------------------------------// BeginMultiSelect / EndMultiSelect
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ImVector<ImGuiSelectionRequest> Requests; // ms:w, app:r / ms:w app:r // Requests
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ImVector<ImGuiSelectionRequest> Requests; // ms:w, app:r / ms:w app:r // Requests to apply to your selection data.
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ImGuiSelectionUserData RangeSrcItem; // ms:w app:r / // (If using clipper) Begin: Source item (generally the first selected item when multi-selecting, which is used as a reference point) must never be clipped!
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ImGuiSelectionUserData NavIdItem; // ms:w, app:r / // (If using deletion) Last known SetNextItemSelectionUserData() value for NavId (if part of submitted items).
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bool NavIdSelected; // ms:w, app:r / app:r // (If using deletion) Last known selection state for NavId (if part of submitted items).
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bool RangeSrcReset; // app:w / ms:r // (If using deletion) Set before EndMultiSelect() to reset ResetSrcItem (e.g. if deleted selection).
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};
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// Helper struct to store multi-selection state + apply multi-selection requests.
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// - Used by our demos and provided as a convenience if you want to quickly implement multi-selection.
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// - Provide an abstraction layer for the purpose of the demo showcasing different forms of underlying selection data.
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// - USING THIS IS NOT MANDATORY. This is only a helper and is not part of the main API. Advanced users are likely to implement their own.
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// To store a single-selection, you only need a single variable and don't need any of this!
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// Optional helper struct to store multi-selection state + apply multi-selection requests.
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// - Used by our demos and provided as a convenience to easily implement basic multi-selection.
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// - USING THIS IS NOT MANDATORY. This is only a helper and not a required API. Advanced users are likely to implement their own.
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// To store a multi-selection, in your real application you could:
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// - A) Use this helper as a convenience. We use our simple key->value ImGuiStorage as a std::set<ImGuiID> replacement.
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// - B) Use your own external storage: e.g. std::set<MyObjectId>, std::vector<MyObjectId>, std::set<index>, interval trees, etc.
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// are generally appropriate. Even a large array of bool might work for you...
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// - C) Use intrusively stored selection (e.g. 'bool IsSelected' inside your object). Not recommended because:
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// - it means you cannot have multiple simultaneous views over your objects.
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// - some of our features requires you to provide the selection _size_, which with this specific strategy require additional work.
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// - B) Use your own external storage: e.g. std::set<MyObjectId>, std::vector<MyObjectId>, interval trees, etc.
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// - C) Use intrusively stored selection (e.g. 'bool IsSelected' inside objects). Not recommended because you can't have multiple views
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// over same objects. Also some features requires to provide selection _size_, which with this strategy requires additional work.
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// Our BeginMultiSelect() api/system doesn't make assumption about:
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// - how you want to identify items in multi-selection API? Indices(*) / Custom Identifiers / Pointers ?
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// - how you want to store persistent selection data? Indices / Custom Identifiers(*) / Pointers ?
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// (*) This is the suggested solution: pass indices to API (because easy to iterate/interpolate) + persist your custom identifiers inside selection data.
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// - how you want to identify items in multi-selection API? Indices(*) or Custom Ids or Pointers -> Indices is better (easy to iterate/interpolate)
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// - how you want to store persistent selection data? Indices or Custom Ids(*) or Pointers -> Custom ids is better (as selection can persist)
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// In ImGuiSelectionBasicStorage we:
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// - always use indices in the multi-selection API (passed to SetNextItemSelectionUserData(), retrieved in ImGuiMultiSelectIO)
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// - use a little extra indirection layer in order to abstract how persistent selection data is derived from an index.
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// - in some cases we use Index as custom identifier (default, not ideal)
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// - use the AdapterIndexToStorageId() indirection layer to abstract how persistent selection data is derived from an index.
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// - in some cases we use Index as custom identifier (default implementation returns Index casted as Identifier): only valid for a never changing item list.
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// - in some cases we read an ID from some custom item data structure (better, and closer to what you would do in your codebase)
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// Many combinations are possible depending on how you prefer to store your items and how you prefer to store your selection.
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// WHEN YOUR APPLICATION SETTLES ON A CHOICE, YOU WILL PROBABLY PREFER TO GET RID OF THE UNNECESSARY 'AdapterIndexToStorageId()' INDIRECTION LOGIC.
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// When your application settles on a choice, you may want to get rid of this indirection layer and do your own thing.
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// Minimum pseudo-code example using this helper:
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// {
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// static vector<MyItem> items; // Your items
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// static ImGuiSelectionBasicStorage selection; // Your selection
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// selection.AdapterData = (void*)&items; // Setup adapter so selection.ApplyRequests() function can convert indexes to identifiers.
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// selection.AdapterIndexToStorageId = [](ImGuiSelectionBasicStorage* self, int idx) { return ((vector<MyItem>*)self->AdapterData))[idx].ID; };
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//
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// ImGuiMultiSelectIO* ms_io = ImGui::BeginMultiSelect(ImGuiMultiSelectFlags_None);
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// selection.ApplyRequests(ms_io, items.Size);
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// for (int idx = 0; idx < items.Size; idx++)
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// {
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// bool item_is_selected = selection.Contains(items[idx].ID);
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// ImGui::SetNextItemSelectionUserData(idx);
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// ImGui::Selectable(label, item_is_selected);
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// }
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// ms_io = ImGui::EndMultiSelect();
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// selection.ApplyRequests(ms_io, items.Size);
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// }
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// In theory, for maximum abstraction, this class could contains AdapterIndexToUserData() and AdapterUserDataToIndex() functions as well,
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// but because we always use indices in SetNextItemSelectionUserData() in the demo, we omit that for clarify.
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// but because we always use indices in SetNextItemSelectionUserData() in the demo, we omit that indirection for clarity.
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struct ImGuiSelectionBasicStorage
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{
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// Members
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ImGuiStorage Storage; // [Internal] Selection set. Think of this as similar to e.g. std::set<ImGuiID>
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int Size; // Number of selected items (== number of 1 in the Storage, maintained by this class).
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// Adapter to convert item index to item identifier
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void* AdapterData; // e.g. selection.AdapterData = (void*)my_items;
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void* AdapterData; // Adapter to convert item index to item identifier // e.g. selection.AdapterData = (void*)my_items;
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ImGuiID (*AdapterIndexToStorageId)(ImGuiSelectionBasicStorage* self, int idx); // e.g. selection.AdapterIndexToStorageId = [](ImGuiSelectionBasicStorage* self, int idx) { return ((MyItems**)self->AdapterData)[idx]->ID; };
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// Selection storage
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// Methods: selection storage
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ImGuiSelectionBasicStorage() { Clear(); AdapterData = NULL; AdapterIndexToStorageId = [](ImGuiSelectionBasicStorage*, int idx) { return (ImGuiID)idx; }; }
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void Clear() { Storage.Data.resize(0); Size = 0; }
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void Swap(ImGuiSelectionBasicStorage& r) { Storage.Data.swap(r.Storage.Data); }
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@ -2865,7 +2873,7 @@ struct ImGuiSelectionBasicStorage
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void UpdateItem(ImGuiID key, bool v) { if (v) { AddItem(key); } else { RemoveItem(key); } }
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int GetSize() const { return Size; }
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// Request handling (apply requests coming from BeginMultiSelect() and EndMultiSelect() functions)
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// Methods: apply selection requests (that are coming from BeginMultiSelect() and EndMultiSelect() functions)
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IMGUI_API void ApplyRequests(ImGuiMultiSelectIO* ms_io, int items_count);
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};
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@ -2783,7 +2783,7 @@ struct ExampleSelectionStorageWithDeletion : ImGuiSelectionBasicStorage
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// - We cannot provide this logic in core Dear ImGui because we don't have access to selection data.
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// - We don't actually manipulate the ImVector<> here, only in ApplyDeletionPostLoop(), but using similar API for consistency and flexibility.
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// - Important: Deletion only works if the underlying ImGuiID for your items are stable: aka not depend on their index, but on e.g. item id/ptr.
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// FIXME-MULTISELECT: Doesn't take account of the possibility focus target will be moved during deletion. Need refocus or offset.
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// FIXME-MULTISELECT: Doesn't take account of the possibility focus target will be moved during deletion. Need refocus or scroll offset.
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int ApplyDeletionPreLoop(ImGuiMultiSelectIO* ms_io, int items_count)
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{
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QueueDeletion = false;
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@ -2890,7 +2890,7 @@ struct ExampleDualListBox
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}
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void Show()
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{
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ImGui::Checkbox("Sorted", &OptKeepSorted);
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//ImGui::Checkbox("Sorted", &OptKeepSorted);
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if (ImGui::BeginTable("split", 3, ImGuiTableFlags_None))
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{
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ImGui::TableSetupColumn("", ImGuiTableColumnFlags_WidthStretch); // Left side
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@ -2964,13 +2964,15 @@ struct ExampleDualListBox
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if (request_move_selected != -1)
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MoveSelected(request_move_selected, request_move_selected ^ 1);
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// FIXME-MULTISELECT: action from outside
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// FIXME-MULTISELECT: Support action from outside
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/*
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if (OptKeepSorted == false)
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{
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ImGui::NewLine();
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if (ImGui::ArrowButton("MoveUp", ImGuiDir_Up)) {}
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if (ImGui::ArrowButton("MoveDown", ImGuiDir_Down)) {}
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}
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*/
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ImGui::EndTable();
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}
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@ -3025,20 +3027,19 @@ static void ShowDemoWindowMultiSelect()
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IMGUI_DEMO_MARKER("Widgets/Selection State/Multi-Select");
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if (ImGui::TreeNode("Multi-Select"))
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{
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// Use default selection.Adapter: Pass index to SetNextItemSelectionUserData(), store index in Selection
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static ImGuiSelectionBasicStorage selection;
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ImGui::Text("Tips: Use 'Debug Log->Selection' to see selection requests as they happen.");
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ImGui::Text("Supported features:");
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ImGui::BulletText("Keyboard navigation (arrows, page up/down, home/end, space).");
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ImGui::BulletText("Ctrl modifier to preserve and toggle selection.");
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ImGui::BulletText("Shift modifier for range selection.");
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ImGui::BulletText("CTRL+A to select all.");
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ImGui::Text("Tip: Use 'Debug Log->Selection' to see selection requests as they happen.");
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// Use default selection.Adapter: Pass index to SetNextItemSelectionUserData(), store index in Selection
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const int ITEMS_COUNT = 50;
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static ImGuiSelectionBasicStorage selection;
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ImGui::Text("Selection: %d/%d", selection.GetSize(), ITEMS_COUNT);
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// The BeginListBox() has no actual purpose for selection logic (other that offering a scrolling region).
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const int ITEMS_COUNT = 50;
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ImGui::Text("Selection: %d/%d", selection.GetSize(), ITEMS_COUNT);
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if (ImGui::BeginListBox("##Basket", ImVec2(-FLT_MIN, ImGui::GetFontSize() * 20)))
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{
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ImGuiMultiSelectFlags flags = ImGuiMultiSelectFlags_ClearOnEscape;
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@ -3124,8 +3125,6 @@ static void ShowDemoWindowMultiSelect()
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ImGui::Text("Adding features:");
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ImGui::BulletText("Dynamic list with Delete key support.");
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ImGui::Text("Selection size: %d/%d", selection.GetSize(), items.Size);
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//if (ImGui::IsItemHovered() && selection.GetSize() > 0)
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// selection.DebugTooltip();
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// Initialize default list with 50 items + button to add/remove items.
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static int items_next_id = 0;
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@ -3146,10 +3145,9 @@ static void ShowDemoWindowMultiSelect()
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ImGuiMultiSelectIO* ms_io = ImGui::BeginMultiSelect(flags);
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selection.ApplyRequests(ms_io, items.Size);
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// FIXME-MULTISELECT: Shortcut(). Hard to demo this? May be helpful to send a helper/optional "delete" signal.
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// FIXME-MULTISELECT: may turn into 'ms_io->RequestDelete' -> need HasSelection passed.
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// FIXME-MULTISELECT: Shortcut(). Hard to demo this? May be helpful to turn into 'ms_io->RequestDelete' signal -> need HasSelection passed.
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// FIXME-MULTISELECT: If pressing Delete + another key we have ambiguous behavior.
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const bool want_delete = selection.QueueDeletion || ((selection.GetSize() > 0) && ImGui::IsWindowFocused() && ImGui::IsKeyPressed(ImGuiKey_Delete));
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const bool want_delete = selection.QueueDeletion || ((selection.Size > 0) && ImGui::IsWindowFocused() && ImGui::IsKeyPressed(ImGuiKey_Delete));
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int item_curr_idx_to_focus = -1;
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if (want_delete)
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item_curr_idx_to_focus = selection.ApplyDeletionPreLoop(ms_io, items.Size);
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@ -3309,9 +3307,8 @@ static void ShowDemoWindowMultiSelect()
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ImGuiMultiSelectIO* ms_io = ImGui::BeginMultiSelect(flags);
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selection.ApplyRequests(ms_io, items.Size);
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// FIXME-MULTISELECT: Shortcut(). Hard to demo this? May be helpful to send a helper/optional "delete" signal.
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// FIXME-MULTISELECT: may turn into 'ms_io->RequestDelete' -> need HasSelection passed.
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const bool want_delete = selection.QueueDeletion || ((selection.GetSize() > 0) && ImGui::IsWindowFocused() && ImGui::IsKeyPressed(ImGuiKey_Delete));
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// FIXME-MULTISELECT: Shortcut(). Hard to demo this? May be helpful to turn into 'ms_io->RequestDelete' signal -> need HasSelection passed.
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const bool want_delete = selection.QueueDeletion || ((selection.Size > 0) && ImGui::IsWindowFocused() && ImGui::IsKeyPressed(ImGuiKey_Delete));
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int item_curr_idx_to_focus = -1;
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if (want_delete)
|
||||
item_curr_idx_to_focus = selection.ApplyDeletionPreLoop(ms_io, items.Size);
|
||||
|
||||
@ -6858,7 +6858,7 @@ bool ImGui::Selectable(const char* label, bool selected, ImGuiSelectableFlags fl
|
||||
// Render
|
||||
if (hovered || selected)
|
||||
{
|
||||
// FIXME-MULTISELECT, FIXME-STYLE: Color for 'selected' elements? ImGuiCol_HeaderSelected
|
||||
// FIXME-MULTISELECT: Styling: Color for 'selected' elements? ImGuiCol_HeaderSelected
|
||||
ImU32 col;
|
||||
if (selected && !hovered)
|
||||
col = GetColorU32(ImLerp(GetStyleColorVec4(ImGuiCol_Header), GetStyleColorVec4(ImGuiCol_HeaderHovered), 0.5f));
|
||||
@ -7558,7 +7558,7 @@ void ImGui::MultiSelectItemFooter(ImGuiID id, bool* p_selected, bool* p_pressed)
|
||||
if (is_shift && !is_singleselect)
|
||||
{
|
||||
// Shift+Arrow always select
|
||||
// Ctrl+Shift+Arrow copy source selection state (alrady stored by BeginMultiSelect() in RangeSelected)
|
||||
// Ctrl+Shift+Arrow copy source selection state (already stored by BeginMultiSelect() in storage->RangeSelected)
|
||||
//IM_ASSERT(storage->HasRangeSrc && storage->HasRangeValue);
|
||||
if (storage->RangeSrcItem == ImGuiSelectionUserData_Invalid)
|
||||
storage->RangeSrcItem = item_data;
|
||||
|
||||
Loading…
Reference in New Issue
Block a user