Aegisub/src/text_selection_controller.h

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// Copyright (c) 2014, Thomas Goyne <plorkyeran@aegisub.org>
//
// Permission to use, copy, modify, and distribute this software for any
// purpose with or without fee is hereby granted, provided that the above
// copyright notice and this permission notice appear in all copies.
//
// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
// ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
// ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
// OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
//
// Aegisub Project http://www.aegisub.org/
#include <libaegisub/signal.h>
class wxStyledTextCtrl;
class wxStyledTextEvent;
class TextSelectionController {
int selection_start = 0;
int selection_end = 0;
int insertion_point = 0;
bool changing = false;
int staged_selection_start = 0;
int staged_selection_end = 0;
bool has_staged_selection = false;
wxStyledTextCtrl *ctrl = nullptr;
void UpdateUI(wxStyledTextEvent &evt);
agi::signal::Signal<> AnnounceSelectionChanged;
public:
void SetSelection(int start, int end);
void SetInsertionPoint(int point);
// This set of functions allows staging changes to the selection or insertion points, which can then be applied later.
// This is useful when one is still waiting on other changes to be applied, but already listening for changes to the
// selection in the eventually visible text.
// They also provide a wrapper for setting a selection whose insertion point is on the left side.
void StageSetSelection(int start, int end) { staged_selection_start = start; staged_selection_end = end; has_staged_selection = true; };
void StageSetInsertionPoint(int point) { StageSetSelection(point, point); };
void CommitStagedChanges();
void DropStagedChanges() { has_staged_selection = false; };
int GetSelectionStart() const { return selection_start; }
int GetSelectionEnd() const { return selection_end; }
int GetInsertionPoint() const { return insertion_point; }
int GetStagedSelectionStart() const { return has_staged_selection ? staged_selection_start : selection_start; }
int GetStagedSelectionEnd() const { return has_staged_selection ? staged_selection_end : selection_end; }
int GetStagedInsertionPoint() const { return has_staged_selection ? staged_selection_end : insertion_point; }
void SetControl(wxStyledTextCtrl *ctrl);
~TextSelectionController();
DEFINE_SIGNAL_ADDERS(AnnounceSelectionChanged, AddSelectionListener)
};