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fc8465aa1f
git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@1795 a592a061-630c-0410-9148-cb99ea01b6c8
495 lines
12 KiB
C
495 lines
12 KiB
C
/* This file is part of
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* ======================================================
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*
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* LyX, The Document Processor
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*
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* Copyright 1995 Matthias Ettrich
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* Copyright 1995-1998 The LyX Team
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*
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* ====================================================== */
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#include <config.h>
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#ifdef __GNUG__
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#pragma implementation "lyxscreen.h"
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#endif
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#include <algorithm>
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#include "lyxscreen.h"
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#include "lyxtext.h"
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#include "lyxrow.h"
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#include "Painter.h"
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#include "WorkArea.h"
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#include "buffer.h"
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#include "font.h"
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#include "insets/insettext.h"
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#include "ColorHandler.h"
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using std::max;
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using std::min;
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namespace {
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GC createGC()
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{
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XGCValues val;
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val.foreground = BlackPixel(fl_get_display(),
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DefaultScreen(fl_get_display()));
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val.function = GXcopy;
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val.graphics_exposures = false;
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val.line_style = LineSolid;
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val.line_width = 0;
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return XCreateGC(fl_get_display(), RootWindow(fl_get_display(), 0),
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GCForeground | GCFunction | GCGraphicsExposures
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| GCLineWidth | GCLineStyle , &val);
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}
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} // namespace anon
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// Constructor
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LyXScreen::LyXScreen(WorkArea & o)
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: owner(o), force_clear(true)
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{
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// the cursor isnt yet visible
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cursor_visible = false;
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cursor_pixmap = 0;
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cursor_pixmap_x = 0;
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cursor_pixmap_y = 0;
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cursor_pixmap_w = 0;
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cursor_pixmap_h = 0;
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// We need this GC
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gc_copy = createGC();
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}
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void LyXScreen::setCursorColor()
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{
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if (!lyxColorHandler.get()) return;
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GC gc = lyxColorHandler->getGCForeground(LColor::cursor);
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XGCValues val;
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XGetGCValues(fl_get_display(),
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gc, GCForeground, &val);
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XChangeGC(fl_get_display(), gc_copy, GCForeground, &val);
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}
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void LyXScreen::Redraw(LyXText * text, BufferView * bv)
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{
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DrawFromTo(text, bv, 0, owner.height());
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expose(0, 0, owner.workWidth(), owner.height());
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if (cursor_visible) {
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cursor_visible = false;
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ShowCursor(text, bv);
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}
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}
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void LyXScreen::expose(int x, int y, int exp_width, int exp_height)
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{
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XCopyArea(fl_get_display(),
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owner.getPixmap(),
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owner.getWin(),
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gc_copy,
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x, y,
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exp_width, exp_height,
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x + owner.xpos(),
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y + owner.ypos());
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}
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void LyXScreen::DrawFromTo(LyXText * text, BufferView * bv,
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int y1, int y2, int y_offset, int x_offset)
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{
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int y_text = text->first + y1;
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// get the first needed row
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Row * row = text->GetRowNearY(y_text);
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// y_text is now the real beginning of the row
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int y = y_text - text->first;
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// y1 is now the real beginning of row on the screen
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while (row != 0 && y < y2) {
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LyXText::text_status st = bv->text->status;
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do {
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bv->text->status = st;
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text->GetVisibleRow(bv, y + y_offset,
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x_offset, row, y + text->first);
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} while (bv->text->status == LyXText::CHANGED_IN_DRAW);
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bv->text->status = st;
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y += row->height();
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row = row->next();
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}
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force_clear = false;
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// maybe we have to clear the screen at the bottom
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if ((y < y2) && text->bv_owner) {
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owner.getPainter().fillRectangle(0, y,
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owner.workWidth(),
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y2 - y,
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LColor::bottomarea);
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}
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}
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void LyXScreen::DrawOneRow(LyXText * text, BufferView * bv, Row * row,
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int y_text, int y_offset, int x_offset)
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{
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int const y = y_text - text->first + y_offset;
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if (((y + row->height()) > 0) &&
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((y - row->height()) <= static_cast<int>(owner.height()))) {
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// ok there is something visible
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LyXText::text_status st = bv->text->status;
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do {
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bv->text->status = st;
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text->GetVisibleRow(bv, y, x_offset, row,
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y + text->first);
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} while (bv->text->status == LyXText::CHANGED_IN_DRAW);
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bv->text->status = st;
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}
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force_clear = false;
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}
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/* draws the screen, starting with textposition y. uses as much already
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* printed pixels as possible */
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void LyXScreen::Draw(LyXText * text, BufferView * bv, unsigned int y)
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{
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if (cursor_visible) HideCursor();
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int const old_first = text->first;
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text->first = y;
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// is any optimiziation possible?
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if ((y - old_first) < owner.height()
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&& (old_first - y) < owner.height()) {
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if (text->first < old_first) {
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DrawFromTo(text, bv, 0, old_first - text->first);
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XCopyArea (fl_get_display(),
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owner.getWin(),
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owner.getWin(),
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gc_copy,
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owner.xpos(),
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owner.ypos(),
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owner.workWidth(),
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owner.height() - old_first + text->first,
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owner.xpos(),
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owner.ypos() + old_first - text->first
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);
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// expose the area drawn
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expose(0, 0,
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owner.workWidth(),
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old_first - text->first);
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} else {
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DrawFromTo(text, bv,
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owner.height() + old_first - text->first,
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owner.height());
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XCopyArea (fl_get_display(),
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owner.getWin(),
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owner.getWin(),
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gc_copy,
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owner.xpos(),
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owner.ypos() + text->first - old_first,
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owner.workWidth(),
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owner.height() + old_first - text->first,
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owner.xpos(),
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owner.ypos());
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// expose the area drawn
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expose(0, owner.height() + old_first - text->first,
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owner.workWidth(), text->first - old_first);
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}
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} else {
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// make a dumb new-draw
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DrawFromTo(text, bv, 0, owner.height());
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expose(0, 0, owner.workWidth(), owner.height());
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}
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}
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void LyXScreen::ShowCursor(LyXText const * text, BufferView const * bv)
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{
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if (!cursor_visible) {
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Cursor_Shape shape = BAR_SHAPE;
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if (text->real_current_font.language() !=
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bv->buffer()->params.language
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|| text->real_current_font.isVisibleRightToLeft()
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!= bv->buffer()->params.language->RightToLeft())
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shape = (text->real_current_font.isVisibleRightToLeft())
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? REVERSED_L_SHAPE : L_SHAPE;
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ShowManualCursor(text, text->cursor.x(), text->cursor.y(),
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lyxfont::maxAscent(text->real_current_font),
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lyxfont::maxDescent(text->real_current_font),
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shape);
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}
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}
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/* returns true if first has changed, otherwise false */
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bool LyXScreen::FitManualCursor(LyXText * text, BufferView * bv,
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int /*x*/, int y, int asc, int desc)
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{
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int newtop = text->first;
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if (y + desc - text->first >= static_cast<int>(owner.height()))
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newtop = y - 3 * owner.height() / 4; // the scroll region must be so big!!
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else if (y - asc < static_cast<int>(text->first)
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&& text->first > 0) {
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newtop = y - owner.height() / 4;
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}
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newtop = max(newtop, 0); // can newtop ever be < 0? (Lgb)
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if (newtop != static_cast<int>(text->first)) {
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Draw(text, bv, newtop);
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text->first = newtop;
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return true;
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}
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return false;
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}
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void LyXScreen::ShowManualCursor(LyXText const * text, int x, int y,
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int asc, int desc, Cursor_Shape shape)
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{
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// Update the cursor color.
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setCursorColor();
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int const y1 = max(y - text->first - asc, 0);
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int const y_tmp = min(y - text->first + desc,
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static_cast<int>(owner.height()));
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// Secure against very strange situations
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int const y2 = max(y_tmp, y1);
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if (cursor_pixmap){
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XFreePixmap(fl_get_display(), cursor_pixmap);
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cursor_pixmap = 0;
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}
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if (y2 > 0 && y1 < int(owner.height())) {
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cursor_pixmap_h = y2 - y1 + 1;
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cursor_pixmap_y = y1;
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switch (shape) {
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case BAR_SHAPE:
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cursor_pixmap_w = 1;
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cursor_pixmap_x = x;
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break;
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case L_SHAPE:
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cursor_pixmap_w = cursor_pixmap_h/3;
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cursor_pixmap_x = x;
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break;
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case REVERSED_L_SHAPE:
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cursor_pixmap_w = cursor_pixmap_h/3;
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cursor_pixmap_x = x - cursor_pixmap_w + 1;
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break;
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}
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cursor_pixmap =
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XCreatePixmap (fl_get_display(),
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fl_root,
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cursor_pixmap_w,
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cursor_pixmap_h,
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fl_get_visual_depth());
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XCopyArea (fl_get_display(),
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owner.getWin(),
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cursor_pixmap,
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gc_copy,
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owner.xpos() + cursor_pixmap_x,
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owner.ypos() + cursor_pixmap_y,
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cursor_pixmap_w,
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cursor_pixmap_h,
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0, 0);
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XDrawLine(fl_get_display(),
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owner.getWin(),
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gc_copy,
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x + owner.xpos(),
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y1 + owner.ypos(),
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x + owner.xpos(),
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y2 + owner.ypos());
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switch (shape) {
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case BAR_SHAPE:
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break;
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case L_SHAPE:
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case REVERSED_L_SHAPE:
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int const rectangle_h = (cursor_pixmap_h + 10) / 20;
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XFillRectangle(fl_get_display(),
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owner.getWin(),
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gc_copy,
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cursor_pixmap_x + owner.xpos(),
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y2 - rectangle_h + 1 + owner.ypos(),
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cursor_pixmap_w - 1, rectangle_h);
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break;
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}
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}
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cursor_visible = true;
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}
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void LyXScreen::HideCursor()
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{
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if (!cursor_visible) return;
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if (cursor_pixmap){
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XCopyArea (fl_get_display(),
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cursor_pixmap,
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owner.getWin(),
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gc_copy,
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0, 0,
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cursor_pixmap_w, cursor_pixmap_h,
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cursor_pixmap_x + owner.xpos(),
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cursor_pixmap_y + owner.ypos());
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}
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cursor_visible = false;
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}
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void LyXScreen::CursorToggle(LyXText const * text, BufferView const * bv)
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{
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if (cursor_visible)
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HideCursor();
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else
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ShowCursor(text, bv);
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}
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/* returns a new top so that the cursor is visible */
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unsigned int LyXScreen::TopCursorVisible(LyXText const * text)
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{
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int newtop = text->first;
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if (text->cursor.y()
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- text->cursor.row()->baseline()
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+ text->cursor.row()->height()
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- text->first >= owner.height()) {
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if (text->cursor.row()->height() < owner.height()
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&& text->cursor.row()->height() > owner.height() / 4)
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newtop = text->cursor.y()
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+ text->cursor.row()->height()
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- text->cursor.row()->baseline() - owner.height();
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else
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newtop = text->cursor.y()
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- 3 * owner.height() / 4; /* the scroll region must be so big!! */
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} else if (static_cast<int>((text->cursor.y()) - text->cursor.row()->baseline()) <
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text->first && text->first > 0)
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{
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if (text->cursor.row()->height() < owner.height()
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&& text->cursor.row()->height() > owner.height() / 4)
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newtop = text->cursor.y() - text->cursor.row()->baseline();
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else {
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newtop = text->cursor.y() - owner.height() / 4;
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newtop = min(newtop, int(text->first));
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}
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}
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newtop = max(newtop, 0);
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return newtop;
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}
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/* scrolls the screen so that the cursor is visible, if necessary.
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* returns true if a change was made, otherwise false */
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bool LyXScreen::FitCursor(LyXText * text, BufferView * bv)
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{
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// Is a change necessary?
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int const newtop = TopCursorVisible(text);
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bool const result = (newtop != text->first);
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if (result)
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Draw(text, bv, newtop);
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return result;
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}
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void LyXScreen::Update(LyXText * text, BufferView * bv,
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int y_offset, int x_offset)
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{
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switch (text->status) {
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case LyXText::NEED_MORE_REFRESH:
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{
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int const y = max(int(text->refresh_y - text->first), 0);
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DrawFromTo(text, bv, y, owner.height(), y_offset, x_offset);
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text->refresh_y = 0;
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text->status = LyXText::UNCHANGED;
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expose(0, y, owner.workWidth(), owner.height() - y);
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}
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break;
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case LyXText::NEED_VERY_LITTLE_REFRESH:
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{
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// ok I will update the current cursor row
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DrawOneRow(text, bv, text->refresh_row, text->refresh_y,
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y_offset, x_offset);
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text->status = LyXText::UNCHANGED;
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expose(0, text->refresh_y - text->first + y_offset,
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owner.workWidth(), text->refresh_row->height());
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}
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break;
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case LyXText::CHANGED_IN_DRAW: // just to remove the warning
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case LyXText::UNCHANGED:
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// Nothing needs done
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break;
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}
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}
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void LyXScreen::ToggleSelection(LyXText * text, BufferView * bv,
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bool kill_selection,
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int y_offset, int x_offset)
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{
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// only if there is a selection
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if (!text->selection) return;
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int const bottom = min(
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max(static_cast<int>(text->sel_end_cursor.y()
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- text->sel_end_cursor.row()->baseline()
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+ text->sel_end_cursor.row()->height()),
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text->first),
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static_cast<int>(text->first + owner.height()));
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int const top = min(
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max(static_cast<int>(text->sel_start_cursor.y() -
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text->sel_start_cursor.row()->baseline()),
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text->first),
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static_cast<int>(text->first + owner.height()));
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if (kill_selection)
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text->selection = 0;
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DrawFromTo(text, bv, top - text->first, bottom - text->first,
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y_offset, x_offset);
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expose(0, top - text->first,
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owner.workWidth(),
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bottom - text->first - (top - text->first));
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}
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void LyXScreen::ToggleToggle(LyXText * text, BufferView * bv,
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int y_offset, int x_offset)
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{
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if (text->toggle_cursor.par() == text->toggle_end_cursor.par()
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&& text->toggle_cursor.pos() == text->toggle_end_cursor.pos())
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return;
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int const top_tmp = text->toggle_cursor.y()
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- text->toggle_cursor.row()->baseline();
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int const bottom_tmp = text->toggle_end_cursor.y()
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- text->toggle_end_cursor.row()->baseline()
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+ text->toggle_end_cursor.row()->height();
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int const bottom = min(max(bottom_tmp, text->first),
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static_cast<int>(text->first + owner.height()));
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int const top = min(max(top_tmp, text->first),
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static_cast<int>(text->first + owner.height()));
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DrawFromTo(text, bv, top - text->first, bottom - text->first, y_offset,
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x_offset);
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expose(0, top - text->first, owner.workWidth(),
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bottom - text->first - (top - text->first));
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}
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