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editors: support move by words, part 1

This commit is contained in:
Vadim Lopatin 2014-04-24 18:28:58 +04:00
parent 7862f897f9
commit aa4e1411b2
2 changed files with 122 additions and 19 deletions
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4
examples/example1/src/main.d
View File

@ -186,14 +186,14 @@ extern (C) int UIAppMain(string[] args) {
text ~= " The quick brown fox jumps over the lazy dog.";
}
editBox.text = text;
editBox.minFontSize(12).maxFontSize(75);
editBox.minFontSize(12).maxFontSize(75); // allow font zoom with Ctrl + MouseWheel
editors.addChild(createEditorSettingsControl(editBox));
editors.addChild(editBox);
editors.addChild(new TextWidget(null, "EditBox: additional view for the same content (split view testing)"d));
EditBox editBox2 = new EditBox("editbox2", ""d);
editBox2.content = editBox.content; // view the same content as first editbox
editBox2.minFontSize(12).maxFontSize(75);
editBox2.minFontSize(12).maxFontSize(75); // allow font zoom with Ctrl + MouseWheel
editors.addChild(editBox2);
editors.layoutHeight(FILL_PARENT).layoutWidth(FILL_PARENT);

137
src/dlangui/widgets/editors.d
View File

@ -331,7 +331,30 @@ class EditableContent {
/// returns text position for end of line lineIndex
TextPosition lineEnd(int lineIndex) {
return TextPosition(lineIndex, lineIndex >= 0 && lineIndex < _lines.length ? cast(int)_lines[lineIndex].length : 0);
return TextPosition(lineIndex, lineLength(lineIndex));
}
/// returns position before first non-space character of line, returns 0 position if no non-space chars
TextPosition firstNonSpace(int lineIndex) {
dstring s = line(lineIndex);
for (int i = 0; i < s.length; i++)
if (s[i] != ' ' && s[i] != '\t')
return TextPosition(lineIndex, i);
return TextPosition(lineIndex, 0);
}
/// returns position after last non-space character of line, returns 0 position if no non-space chars on line
TextPosition lastNonSpace(int lineIndex) {
dstring s = line(lineIndex);
for (int i = cast(int)s.length - 1; i >= 0; i--)
if (s[i] != ' ' && s[i] != '\t')
return TextPosition(lineIndex, i + 1);
return TextPosition(lineIndex, 0);
}
/// returns text position for end of line lineIndex
int lineLength(int lineIndex) {
return lineIndex >= 0 && lineIndex < _lines.length ? cast(int)_lines[lineIndex].length : 0;
}
/// returns maximum length of line
@ -375,6 +398,29 @@ class EditableContent {
return res;
}
/// when position is out of content bounds, fix it to nearest valid position
void correctPosition(ref TextPosition position) {
if (position.line >= length) {
position.line = length - 1;
position.pos = lineLength(position.line);
}
if (position.line < 0) {
position.line = 0;
position.pos = 0;
}
int currentLineLength = lineLength(position.line);
if (position.pos > currentLineLength)
position.pos = currentLineLength;
if (position.pos < 0)
position.pos = 0;
}
/// when range positions is out of content bounds, fix it to nearest valid position
void correctRange(ref TextRange range) {
correctPosition(range.start);
correctPosition(range.end);
}
/// removes removedCount lines starting from start
protected void removeLines(int start, int removedCount) {
int end = start + removedCount;
@ -427,12 +473,82 @@ class EditableContent {
}
}
static bool isDigit(dchar ch) pure nothrow {
return ch >= '0' && ch <= '9';
}
static bool isAlpha(dchar ch) pure nothrow {
return (ch >= 'a' && ch <= 'z') || (ch >= 'A' && ch <= 'Z') || (ch == '_');
}
static bool isLowerAlpha(dchar ch) pure nothrow {
return (ch >= 'a' && ch <= 'z') || (ch == '_');
}
static bool isUpperAlpha(dchar ch) pure nothrow {
return (ch >= 'A' && ch <= 'Z');
}
/// change text position to nearest word bound (direction < 0 - back, > 0 - forward)
TextPosition moveByWord(TextPosition p, int direction, bool camelCasePartsAsWords) {
correctPosition(p);
TextPosition firstns = firstNonSpace(p.line); // before first non space
TextPosition lastns = lastNonSpace(p.line); // after last non space
int linelen = lineLength(p.line); // line length
if (direction < 0) {
// back
if (p.pos <= 0) {
// beginning of line - move to prev line
if (p.line > 0)
p = lastNonSpace(p.line - 1);
} else if (p.pos <= firstns.pos) { // before first nonspace
// to beginning of line
p.pos = 0;
} else {
}
} else if (direction > 0) {
// forward
if (p.pos >= linelen) {
// last position of line
if (p.line < length)
p = firstNonSpace(p.line + 1);
} else if (p.pos >= lastns.pos) { // before first nonspace
// to beginning of line
p.pos = linelen;
} else {
dstring txt = line(p.line);
int found = -1;
for (int i = p.pos; i < linelen; i++) {
// check if position i + 1 is after word end
dchar thischar = txt[i];
if (thischar == '\t')
thischar = ' ';
dchar nextchar = i < linelen ? txt[i + 1] : ' ';
if (nextchar == '\t')
nextchar = ' ';
bool thisalpha = isAlpha(thischar);
bool nextalpha = isAlpha(nextchar);
if ((thisalpha && !nextalpha)
|| (camelCasePartsAsWords && isLowerAlpha(thischar) && isUpperAlpha(nextchar))
|| (thischar != ' ' && nextchar == ' ')
) {
found = i + 1;
break;
}
}
if (found >= 0)
p.pos = found;
else
p.pos = linelen;
}
}
return p;
}
/// edit content
bool performOperation(EditOperation op, Object source) {
if (_readOnly)
throw new Exception("content is readonly");
if (op.action == EditAction.Replace) {
TextRange rangeBefore = op.range;
correctRange(rangeBefore);
dstring[] oldcontent = rangeText(rangeBefore);
dstring[] newcontent = op.content;
if (newcontent.length == 0)
@ -903,24 +1019,11 @@ class EditWidgetBase : WidgetGroup, EditableContentListener {
protected void updateScrollbars() {
}
/// when position is out of content bounds, fix it to nearest valid position
protected void correctPosition(ref TextPosition position) {
if (position.line >= _content.length)
position.line = _content.length - 1;
if (position.line < 0)
position.line = 0;
dstring currentLine = _content[position.line];
if (position.pos > currentLine.length)
position.pos = cast(int)currentLine.length;
if (position.pos < 0)
position.pos = 0;
}
/// when cursor position or selection is out of content bounds, fix it to nearest valid position
protected void correctCaretPos() {
correctPosition(_caretPos);
correctPosition(_selectionRange.start);
correctPosition(_selectionRange.end);
_content.correctPosition(_caretPos);
_content.correctPosition(_selectionRange.start);
_content.correctPosition(_selectionRange.end);
if (_selectionRange.empty)
_selectionRange = TextRange(_caretPos, _caretPos);
}