The old implementation of Row::Element::pos2x and x2pos did not work
correctly with Arabic text, because characters can have shapes that
depend on context.
This new implementation leverages QTextLayout in a simplified way,
since only one word is added to the layout.
This allows to make Row::Element::x2pos more readable.
Fixes: #9115.
All these problems are related to what happens at the extreme points of rows
* since VIRTUAL elements have a width but no contents, they have to
be treated specially at some places. It would have been better to
avoid testing for them explicitly, but I did not find a way.
* Improve and cleanup the code in breakRow and fix in passing a crash
when clicking on the right of an incomplete MARGIN_MANUAL
paragraph.
* improve the computation of row width in TextMetrics::computeRowMetrics.
* handle properly the case where a position if not found on the row
in both cursorX and getPosNearX (actually, this happens when
selecting).
* Some code cleanup and comments.
* fix handling of boundary situations in Row::Elements::x2pos;
* fix handling of boundary situations in TextMetrics::getColumnNearX;
* make sure to always use Font::isVisibleRightToLeft instead of Font::isRightToLeft;
* Improve debug messages.
Break words longer than the screen width. The code is more complicated
than I would like, but I have no better idea right now.
Implement properly the notion of a row broken by a display inset. This is useful in different places.
Also fix a bug with last line of a paragraph spotted by Kornel.
Use proper font everywhere for end-of-par marker
Fix getColumnNearX for RTL text and for centered/right-justified paragraphs.
Let computeRowMetrics update the row width.
* convert cursorX to new scheme; old computation is still there for the sake of comparison.
* use Row to compute separator width in computeRowMetrics; again, the old code is retained for now.
* Get rid of rowWidth()
* Row now contains a vector of Elements
* replace Row::dump by a proper << operator
* the width is updated as elements are added
* breakRow is reimplmented to use this infrastructure
1. When a listing is inserted in a bit of text, the line above the listing is not drawn over the full width like it is done for lines above other insets. This is because InsetListing has a AlignLeft alignment. Now, if you start selecting downwards with the mouse in this empty area, strange selection drawings appear (see attachment).
This is caused by the fact that starting your selection at such a place, causes beg.boundary() to be true in TextMetrics::drawRowSelection(..). This is correct, but this value is true for _all_ selected lines. Now, the selection acts as if it is RTL text. Therefore, just like for end.boundary, this value needs to be reset for every line.
2. Starting your selection in an end margin often causes the selection in this end margin to be painted later. This is because when starting your selection in an end margin, you may have set a (possible empty) selection before really selecting the end margin. The problem is that the checksum (computed later) is the same for this empty selection and for the end margin selection. Therfore, we need a call to cur.setSelection() before evaluating cur.selection().
3. In the following two lines, it is assumed that there is only an end margin to be painted if the selection extends to the next paragraph. This is not true for the above described case of an AlignLeft Inset. Then, the margin has also be drawn within a paragraph
4. The end and begin margins are only painted when the selection extends into the following or previous paragraph. This difference is not resembled in the checksum if you first select a row completely and then procede to the next or previous paragraph as the selection remains at the end of a row. This also holds for the AlignLeft case. Therefore I added a term to the checksum to monitor whether the end and begin margins need to be drawn.
git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@26399 a592a061-630c-0410-9148-cb99ea01b6c8
* ParagraphMetrics::computeRowSignature(): Integrate row's dimensions and selection status in the row signature.
* TextMetrics::drawParagraph(): compute the row signature here and rely on that to decide if a redraw is needed or not.
* BufferView::Private: get rid of the ViewMetricsInfo member. Just keep the ScreenUpdateStrategy.
* BufferView::draw(): full screen update even for singlePar case because the row signature will detect if something needs to be redrawn.
* Text3.cpp: get rid of hack following architecture update.
git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@21650 a592a061-630c-0410-9148-cb99ea01b6c8
- Modifier on return type ignored
- Ambigous else
- Ambigous logical operators
- Semi-colon instead of empty block
- Missing header files
- Missing using std::XX
- Initialization out of order
git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@20304 a592a061-630c-0410-9148-cb99ea01b6c8
* Row:
- setSelection(): set selection begin and end for this row.
- sel_beg, sel_end: new public members.
* BufferView::draw()
- do not trigger a full repaint for selection.
- use TextMetrics::draw() instead of hand calling TextMetrics::drawParagraph().
* InsetText::draw(): don't call TextMetrics::drawSelection().
* InsetMathMBox::drawSelection(): remove.
* TextMetrics:
- drawSelection(): simplify a bit. Now private.
- redoParagraph(): memorize Row selection status.
- x2pos(): fix crash when selecting with PageDown.
- draw(): fill-in the ParPos cache before everything else and not in drawParagraph().
- drawParagraph(): take care of row selection painting.
git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@20066 a592a061-630c-0410-9148-cb99ea01b6c8
^ Row:
- changed_: new boolean to inform change status at draw time.
- crc_: new crc_ signature
- inline pos() and endpos()
- replace width(), ascent() and descent() direct access with dimension().
* ParagraphMetrics
- do not maintain row_signature_ anymore
- rename calculateRowSignature() to computeRowSignature() and make it public
* TextMetrics
- redoParagraph(): don't clear the ParagraphMetrics row list, reuse and update it.
- rowHeight(), rowWidth(), rowBreakPoint(): take first/end positions instead of Row.
git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@19895 a592a061-630c-0410-9148-cb99ea01b6c8
