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Popups: added comments, reorganized the functions in imgui.h

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ocornut
2020-06-16 23:05:01 +02:00
parent 6e138504c1
commit 078571b7a9
4 changed files with 34 additions and 25 deletions
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imgui.h
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@ -591,28 +591,34 @@ namespace ImGui
IMGUI_API void SetTooltipV(const char* fmt, va_list args) IM_FMTLIST(1);
// Popups, Modals
// The properties of popups windows are:
// - They block normal mouse hovering detection outside them. (*1)
// - Unless modal, they can be closed by clicking anywhere outside them, or by pressing ESCAPE.
// Because hovering detection is disabled outside the popup, when clicking outside the click will not be seen by underlying widgets! (*1)
// - Their visibility state (~bool) is held internally by Dear ImGui instead of being held by the programmer as we are used to with regular Begin() calls.
// User can manipulate the visibility state by calling OpenPopup(), CloseCurrentPopup() etc.
// - We default to use the right mouse (ImGuiMouseButton_Right=1) for the Popup Context functions.
// Those three properties are connected: we need to retain popup visibility state in the library because popups may be closed as any time.
// (*1) You can bypass that restriction and detect hovering even when normally blocked by a popup.
// To do this use the ImGuiHoveredFlags_AllowWhenBlockedByPopup when calling IsItemHovered() or IsWindowHovered().
// This is what BeginPopupContextItem() and BeginPopupContextWindow() are doing already, allowing a right-click to reopen another popups without losing the click.
// - The BeginPopupContextXXX functions are essentially helpers to do an OpenPopup() in some condition + BeginPopup().
IMGUI_API void OpenPopup(const char* str_id); // call to mark popup as open (don't call every frame!). popups are closed when user click outside, or if CloseCurrentPopup() is called within a BeginPopup()/EndPopup() block. By default, Selectable()/MenuItem() are calling CloseCurrentPopup(). Popup identifiers are relative to the current ID-stack (so OpenPopup and BeginPopup needs to be at the same level).
IMGUI_API bool BeginPopup(const char* str_id, ImGuiWindowFlags flags = 0); // return true if the popup is open, and you can start outputting to it. only call EndPopup() if BeginPopup() returns true!
IMGUI_API bool BeginPopupContextItem(const char* str_id = NULL, ImGuiMouseButton mouse_button = 1); // helper to open and begin popup when clicked on last item. if you can pass a NULL str_id only if the previous item had an id. If you want to use that on a non-interactive item such as Text() you need to pass in an explicit ID here. read comments in .cpp!
IMGUI_API bool BeginPopupContextWindow(const char* str_id = NULL, ImGuiMouseButton mouse_button = 1, bool also_over_items = true); // helper to open and begin popup when clicked on current window.
IMGUI_API bool BeginPopupContextVoid(const char* str_id = NULL, ImGuiMouseButton mouse_button = 1); // helper to open and begin popup when clicked in void (where there are no imgui windows).
IMGUI_API bool BeginPopupModal(const char* name, bool* p_open = NULL, ImGuiWindowFlags flags = 0); // modal dialog (regular window with title bar, block interactions behind the modal window, can't close the modal window by clicking outside)
IMGUI_API void EndPopup(); // only call EndPopup() if BeginPopupXXX() returns true!
IMGUI_API bool OpenPopupContextItem(const char* str_id = NULL, ImGuiMouseButton mouse_button = 1); // helper to open popup when clicked on last item. return true when just opened. (note: actually triggers on the mouse _released_ event to be consistent with popup behaviors)
IMGUI_API bool IsPopupOpen(const char* str_id); // return true if the popup is open at the current BeginPopup() level of the popup stack
IMGUI_API void CloseCurrentPopup(); // close the popup we have begin-ed into. clicking on a MenuItem or Selectable automatically close the current popup.
// - They block normal mouse hovering detection (and therefore most mouse interactions) behind them.
// - If not modal: they can be closed by clicking anywhere outside them, or by pressing ESCAPE.
// - Their visibility state (~bool) is held internally instead of being held by the programmer as we are used to with regular Begin*() calls.
// - The 3 properties above are related: we need to retain popup visibility state in the library because popups may be closed as any time.
// - You can bypass the hovering restriction by using ImGuiHoveredFlags_AllowWhenBlockedByPopup when calling IsItemHovered() or IsWindowHovered().
// - IMPORTANT: Popup identifiers are relative to the current ID stack, so OpenPopup and BeginPopup generally needs to be at the same level of the stack.
// This is sometimes leading to confusing mistakes. May rework this in the future.
// Popups: begin/end functions
// - BeginPopup(): query popup state, if open start appending into the window. Call EndPopup() afterwards. ImGuiWindowFlags are forwarded to the window.
// - BeginPopupModal(): block every interactions behind the window, cannot be closed by user, add a dimming background, has a title bar.
IMGUI_API bool BeginPopup(const char* str_id, ImGuiWindowFlags flags = 0); // return true if the popup is open, and you can start outputting to it.
IMGUI_API bool BeginPopupModal(const char* name, bool* p_open = NULL, ImGuiWindowFlags flags = 0); // return true if the modal is open, and you can start outputting to it.
IMGUI_API void EndPopup(); // only call EndPopup() if BeginPopupXXX() returns true!
// Popups: open/close functions
// - OpenPopup(): set popup state to open.
// - If not modal: they can be closed by clicking anywhere outside them, or by pressing ESCAPE.
// - CloseCurrentPopup(): use inside the BeginPopup()/EndPopup() scope to close manually.
// - CloseCurrentPopup() is called by default by Selectable()/MenuItem() when activated (FIXME: need some options).
IMGUI_API void OpenPopup(const char* str_id); // call to mark popup as open (don't call every frame!).
IMGUI_API bool OpenPopupContextItem(const char* str_id = NULL, ImGuiMouseButton mouse_b = 1); // helper to open popup when clicked on last item. return true when just opened. (note: actually triggers on the mouse _released_ event to be consistent with popup behaviors)
IMGUI_API void CloseCurrentPopup(); // manually close the popup we have begin-ed into.
IMGUI_API bool IsPopupOpen(const char* str_id); // return true if the popup is open at the current BeginPopup() level of the popup stack
// Popups: open+begin combined functions helpers
// - Helpers to do OpenPopup+BeginPopup where the Open action is triggered by e.g. hovering an item and right-clicking.
// - They are convenient to easily create context menus, hence the name.
IMGUI_API bool BeginPopupContextItem(const char* str_id = NULL, ImGuiMouseButton mouse_b = 1); // open+begin popup when clicked on last item. if you can pass a NULL str_id only if the previous item had an id. If you want to use that on a non-interactive item such as Text() you need to pass in an explicit ID here. read comments in .cpp!
IMGUI_API bool BeginPopupContextWindow(const char* str_id = NULL, ImGuiMouseButton mouse_b = 1, bool also_over_items = true); // open+begin popup when clicked on current window.
IMGUI_API bool BeginPopupContextVoid(const char* str_id = NULL, ImGuiMouseButton mouse_b = 1); // open+begin popup when clicked in void (where there are no windows).
// Columns
// - You can also use SameLine(pos_x) to mimic simplified columns.