419 lines
10 KiB
C++
419 lines
10 KiB
C++
// Scintilla source code edit control
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/** @file Selection.cxx
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** Classes maintaining the selection.
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**/
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// Copyright 2009 by Neil Hodgson <neilh@scintilla.org>
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// The License.txt file describes the conditions under which this software may be distributed.
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#include <stdlib.h>
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#include <vector>
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#include <algorithm>
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#include "Platform.h"
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#include "Scintilla.h"
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#include "Selection.h"
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#ifdef SCI_NAMESPACE
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using namespace Scintilla;
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#endif
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void SelectionPosition::MoveForInsertDelete(bool insertion, int startChange, int length) {
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if (insertion) {
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if (position == startChange) {
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int virtualLengthRemove = std::min(length, virtualSpace);
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virtualSpace -= virtualLengthRemove;
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position += virtualLengthRemove;
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} else if (position > startChange) {
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position += length;
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}
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} else {
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if (position == startChange) {
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virtualSpace = 0;
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}
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if (position > startChange) {
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int endDeletion = startChange + length;
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if (position > endDeletion) {
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position -= length;
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} else {
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position = startChange;
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virtualSpace = 0;
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}
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}
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}
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}
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bool SelectionPosition::operator <(const SelectionPosition &other) const {
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if (position == other.position)
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return virtualSpace < other.virtualSpace;
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else
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return position < other.position;
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}
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bool SelectionPosition::operator >(const SelectionPosition &other) const {
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if (position == other.position)
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return virtualSpace > other.virtualSpace;
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else
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return position > other.position;
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}
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bool SelectionPosition::operator <=(const SelectionPosition &other) const {
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if (position == other.position && virtualSpace == other.virtualSpace)
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return true;
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else
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return other > *this;
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}
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bool SelectionPosition::operator >=(const SelectionPosition &other) const {
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if (position == other.position && virtualSpace == other.virtualSpace)
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return true;
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else
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return *this > other;
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}
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int SelectionRange::Length() const {
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if (anchor > caret) {
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return anchor.Position() - caret.Position();
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} else {
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return caret.Position() - anchor.Position();
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}
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}
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void SelectionRange::MoveForInsertDelete(bool insertion, int startChange, int length) {
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caret.MoveForInsertDelete(insertion, startChange, length);
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anchor.MoveForInsertDelete(insertion, startChange, length);
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}
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bool SelectionRange::Contains(int pos) const {
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if (anchor > caret)
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return (pos >= caret.Position()) && (pos <= anchor.Position());
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else
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return (pos >= anchor.Position()) && (pos <= caret.Position());
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}
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bool SelectionRange::Contains(SelectionPosition sp) const {
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if (anchor > caret)
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return (sp >= caret) && (sp <= anchor);
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else
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return (sp >= anchor) && (sp <= caret);
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}
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bool SelectionRange::ContainsCharacter(int posCharacter) const {
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if (anchor > caret)
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return (posCharacter >= caret.Position()) && (posCharacter < anchor.Position());
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else
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return (posCharacter >= anchor.Position()) && (posCharacter < caret.Position());
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}
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SelectionSegment SelectionRange::Intersect(SelectionSegment check) const {
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SelectionSegment inOrder(caret, anchor);
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if ((inOrder.start <= check.end) || (inOrder.end >= check.start)) {
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SelectionSegment portion = check;
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if (portion.start < inOrder.start)
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portion.start = inOrder.start;
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if (portion.end > inOrder.end)
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portion.end = inOrder.end;
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if (portion.start > portion.end)
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return SelectionSegment();
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else
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return portion;
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} else {
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return SelectionSegment();
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}
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}
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bool SelectionRange::Trim(SelectionRange range) {
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SelectionPosition startRange = range.Start();
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SelectionPosition endRange = range.End();
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SelectionPosition start = Start();
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SelectionPosition end = End();
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PLATFORM_ASSERT(start <= end);
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PLATFORM_ASSERT(startRange <= endRange);
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if ((startRange <= end) && (endRange >= start)) {
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if ((start > startRange) && (end < endRange)) {
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// Completely covered by range -> empty at start
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end = start;
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} else if ((start < startRange) && (end > endRange)) {
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// Completely covers range -> empty at start
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end = start;
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} else if (start <= startRange) {
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// Trim end
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end = startRange;
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} else { //
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PLATFORM_ASSERT(end >= endRange);
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// Trim start
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start = endRange;
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}
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if (anchor > caret) {
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caret = start;
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anchor = end;
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} else {
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anchor = start;
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caret = end;
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}
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return Empty();
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} else {
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return false;
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}
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}
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// If range is all virtual collapse to start of virtual space
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void SelectionRange::MinimizeVirtualSpace() {
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if (caret.Position() == anchor.Position()) {
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int virtualSpace = caret.VirtualSpace();
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if (virtualSpace > anchor.VirtualSpace())
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virtualSpace = anchor.VirtualSpace();
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caret.SetVirtualSpace(virtualSpace);
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anchor.SetVirtualSpace(virtualSpace);
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}
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}
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Selection::Selection() : mainRange(0), moveExtends(false), tentativeMain(false), selType(selStream) {
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AddSelection(SelectionRange(SelectionPosition(0)));
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}
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Selection::~Selection() {
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}
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bool Selection::IsRectangular() const {
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return (selType == selRectangle) || (selType == selThin);
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}
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int Selection::MainCaret() const {
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return ranges[mainRange].caret.Position();
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}
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int Selection::MainAnchor() const {
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return ranges[mainRange].anchor.Position();
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}
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SelectionRange &Selection::Rectangular() {
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return rangeRectangular;
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}
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SelectionSegment Selection::Limits() const {
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if (ranges.empty()) {
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return SelectionSegment();
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} else {
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SelectionSegment sr(ranges[0].anchor, ranges[0].caret);
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for (size_t i=1; i<ranges.size(); i++) {
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sr.Extend(ranges[i].anchor);
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sr.Extend(ranges[i].caret);
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}
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return sr;
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}
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}
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SelectionSegment Selection::LimitsForRectangularElseMain() const {
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if (IsRectangular()) {
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return Limits();
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} else {
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return SelectionSegment(ranges[mainRange].caret, ranges[mainRange].anchor);
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}
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}
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size_t Selection::Count() const {
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return ranges.size();
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}
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size_t Selection::Main() const {
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return mainRange;
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}
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void Selection::SetMain(size_t r) {
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PLATFORM_ASSERT(r < ranges.size());
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mainRange = r;
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}
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SelectionRange &Selection::Range(size_t r) {
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return ranges[r];
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}
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const SelectionRange &Selection::Range(size_t r) const {
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return ranges[r];
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}
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SelectionRange &Selection::RangeMain() {
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return ranges[mainRange];
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}
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const SelectionRange &Selection::RangeMain() const {
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return ranges[mainRange];
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}
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SelectionPosition Selection::Start() const {
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if (IsRectangular()) {
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return rangeRectangular.Start();
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} else {
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return ranges[mainRange].Start();
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}
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}
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bool Selection::MoveExtends() const {
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return moveExtends;
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}
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void Selection::SetMoveExtends(bool moveExtends_) {
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moveExtends = moveExtends_;
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}
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bool Selection::Empty() const {
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for (size_t i=0; i<ranges.size(); i++) {
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if (!ranges[i].Empty())
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return false;
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}
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return true;
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}
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SelectionPosition Selection::Last() const {
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SelectionPosition lastPosition;
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for (size_t i=0; i<ranges.size(); i++) {
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if (lastPosition < ranges[i].caret)
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lastPosition = ranges[i].caret;
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if (lastPosition < ranges[i].anchor)
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lastPosition = ranges[i].anchor;
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}
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return lastPosition;
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}
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int Selection::Length() const {
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int len = 0;
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for (size_t i=0; i<ranges.size(); i++) {
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len += ranges[i].Length();
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}
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return len;
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}
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void Selection::MovePositions(bool insertion, int startChange, int length) {
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for (size_t i=0; i<ranges.size(); i++) {
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ranges[i].MoveForInsertDelete(insertion, startChange, length);
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}
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if (selType == selRectangle) {
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rangeRectangular.MoveForInsertDelete(insertion, startChange, length);
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}
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}
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void Selection::TrimSelection(SelectionRange range) {
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for (size_t i=0; i<ranges.size();) {
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if ((i != mainRange) && (ranges[i].Trim(range))) {
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// Trimmed to empty so remove
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for (size_t j=i; j<ranges.size()-1; j++) {
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ranges[j] = ranges[j+1];
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if (j == mainRange-1)
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mainRange--;
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}
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ranges.pop_back();
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} else {
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i++;
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}
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}
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}
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void Selection::SetSelection(SelectionRange range) {
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ranges.clear();
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ranges.push_back(range);
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mainRange = ranges.size() - 1;
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}
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void Selection::AddSelection(SelectionRange range) {
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TrimSelection(range);
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ranges.push_back(range);
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mainRange = ranges.size() - 1;
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}
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void Selection::AddSelectionWithoutTrim(SelectionRange range) {
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ranges.push_back(range);
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mainRange = ranges.size() - 1;
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}
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void Selection::DropSelection(size_t r) {
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if ((ranges.size() > 1) && (r < ranges.size())) {
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size_t mainNew = mainRange;
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if (mainNew >= r) {
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if (mainNew == 0) {
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mainNew = ranges.size() - 2;
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} else {
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mainNew--;
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}
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}
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ranges.erase(ranges.begin() + r);
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mainRange = mainNew;
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}
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}
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void Selection::TentativeSelection(SelectionRange range) {
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if (!tentativeMain) {
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rangesSaved = ranges;
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}
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ranges = rangesSaved;
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AddSelection(range);
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TrimSelection(ranges[mainRange]);
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tentativeMain = true;
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}
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void Selection::CommitTentative() {
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rangesSaved.clear();
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tentativeMain = false;
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}
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int Selection::CharacterInSelection(int posCharacter) const {
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for (size_t i=0; i<ranges.size(); i++) {
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if (ranges[i].ContainsCharacter(posCharacter))
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return i == mainRange ? 1 : 2;
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}
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return 0;
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}
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int Selection::InSelectionForEOL(int pos) const {
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for (size_t i=0; i<ranges.size(); i++) {
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if (!ranges[i].Empty() && (pos > ranges[i].Start().Position()) && (pos <= ranges[i].End().Position()))
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return i == mainRange ? 1 : 2;
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}
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return 0;
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}
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int Selection::VirtualSpaceFor(int pos) const {
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int virtualSpace = 0;
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for (size_t i=0; i<ranges.size(); i++) {
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if ((ranges[i].caret.Position() == pos) && (virtualSpace < ranges[i].caret.VirtualSpace()))
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virtualSpace = ranges[i].caret.VirtualSpace();
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if ((ranges[i].anchor.Position() == pos) && (virtualSpace < ranges[i].anchor.VirtualSpace()))
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virtualSpace = ranges[i].anchor.VirtualSpace();
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}
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return virtualSpace;
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}
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void Selection::Clear() {
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ranges.clear();
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ranges.push_back(SelectionRange());
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mainRange = ranges.size() - 1;
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selType = selStream;
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moveExtends = false;
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ranges[mainRange].Reset();
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rangeRectangular.Reset();
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}
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void Selection::RemoveDuplicates() {
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for (size_t i=0; i<ranges.size()-1; i++) {
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if (ranges[i].Empty()) {
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size_t j=i+1;
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while (j<ranges.size()) {
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if (ranges[i] == ranges[j]) {
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ranges.erase(ranges.begin() + j);
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if (mainRange >= j)
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mainRange--;
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} else {
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j++;
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}
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}
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}
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}
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}
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void Selection::RotateMain() {
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mainRange = (mainRange + 1) % ranges.size();
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}
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