lyx_mirror/src/screen.C

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/* This file is part of
* ======================================================
*
* LyX, The Document Processor
*
* Copyright 1995 Matthias Ettrich
* Copyright 1995-1998 The LyX Team
*
* ====================================================== */
#include <config.h>
#ifdef __GNUG__
#pragma implementation "lyxscreen.h"
#endif
#include <algorithm>
#include "lyxscreen.h"
#include "lyxtext.h"
#include "lyxrow.h"
#include "Painter.h"
#include "WorkArea.h"
#include "buffer.h"
#include "BufferView.h"
#include "font.h"
#include "insets/insettext.h"
#include "ColorHandler.h"
#include "language.h"
using std::max;
using std::min;
namespace {
GC createGC()
{
XGCValues val;
val.foreground = BlackPixel(fl_get_display(),
DefaultScreen(fl_get_display()));
val.function = GXcopy;
val.graphics_exposures = false;
val.line_style = LineSolid;
val.line_width = 0;
return XCreateGC(fl_get_display(), RootWindow(fl_get_display(), 0),
GCForeground | GCFunction | GCGraphicsExposures
| GCLineWidth | GCLineStyle , &val);
}
} // namespace anon
// Constructor
LyXScreen::LyXScreen(WorkArea & o)
: owner(o), force_clear(true)
{
// the cursor isnt yet visible
cursor_visible = false;
cursor_pixmap = 0;
cursor_pixmap_x = 0;
cursor_pixmap_y = 0;
cursor_pixmap_w = 0;
cursor_pixmap_h = 0;
// We need this GC
gc_copy = createGC();
}
LyXScreen::~LyXScreen()
{
XFreeGC(fl_get_display(), gc_copy);
}
void LyXScreen::setCursorColor()
{
if (!lyxColorHandler.get()) return;
GC gc = lyxColorHandler->getGCForeground(LColor::cursor);
XGCValues val;
XGetGCValues(fl_get_display(),
gc, GCForeground, &val);
XChangeGC(fl_get_display(), gc_copy, GCForeground, &val);
}
void LyXScreen::redraw(LyXText * text, BufferView * bv)
{
drawFromTo(text, bv, 0, owner.height(), 0, 0, text == bv->text);
expose(0, 0, owner.workWidth(), owner.height());
if (cursor_visible) {
cursor_visible = false;
bv->showCursor();
}
}
void LyXScreen::expose(int x, int y, int exp_width, int exp_height)
{
XCopyArea(fl_get_display(),
owner.getPixmap(),
owner.getWin(),
gc_copy,
x, y,
exp_width, exp_height,
x + owner.xpos(),
y + owner.ypos());
}
void LyXScreen::drawFromTo(LyXText * text, BufferView * bv,
int y1, int y2, int y_offset, int x_offset,
bool internal)
{
int y_text = text->first + y1;
// get the first needed row
Row * row = text->getRowNearY(y_text);
// y_text is now the real beginning of the row
int y = y_text - text->first;
// y1 is now the real beginning of row on the screen
while (row != 0 && y < y2) {
LyXText::text_status st = text->status();
text->getVisibleRow(bv, y + y_offset,
x_offset, row, y + text->first);
internal = internal && (st != LyXText::CHANGED_IN_DRAW);
while(internal && text->status() == LyXText::CHANGED_IN_DRAW) {
if (text->fullRebreak(bv)) {
st = LyXText::NEED_MORE_REFRESH;
text->setCursor(bv, text->cursor.par(), text->cursor.pos());
}
text->status(bv, st);
text->getVisibleRow(bv, y + y_offset,
x_offset, row, y + text->first);
}
y += row->height();
row = row->next();
}
force_clear = false;
// maybe we have to clear the screen at the bottom
if ((y < y2) && text->bv_owner) {
owner.getPainter().fillRectangle(0, y,
owner.workWidth(),
y2 - y,
LColor::bottomarea);
}
}
void LyXScreen::drawOneRow(LyXText * text, BufferView * bv, Row * row,
int y_text, int y_offset, int x_offset)
{
int const y = y_text - text->first + y_offset;
if (((y + row->height()) > 0) &&
((y - row->height()) <= static_cast<int>(owner.height()))) {
// ok there is something visible
#if 0
LyXText::text_status st = bv->text->status();
do {
bv->text->status(bv, st);
text->getVisibleRow(bv, y, x_offset, row,
y + text->first);
} while (!text->inset_owner &&
text->status() == LyXText::CHANGED_IN_DRAW);
bv->text->status(bv, st);
#else
text->getVisibleRow(bv, y, x_offset, row, y + text->first);
#endif
}
force_clear = false;
}
/* draws the screen, starting with textposition y. uses as much already
* printed pixels as possible */
void LyXScreen::draw(LyXText * text, BufferView * bv, unsigned int y)
{
if (cursor_visible) hideCursor();
int const old_first = text->first;
bool internal = (text == bv->text);
text->first = y;
// is any optimiziation possible?
if ((y - old_first) < owner.height()
&& (old_first - y) < owner.height())
{
if (text->first < old_first) {
drawFromTo(text, bv, 0, old_first - text->first, 0, 0, internal);
XCopyArea (fl_get_display(),
owner.getWin(),
owner.getWin(),
gc_copy,
owner.xpos(),
owner.ypos(),
owner.workWidth(),
owner.height() - old_first + text->first,
owner.xpos(),
owner.ypos() + old_first - text->first
);
// expose the area drawn
expose(0, 0,
owner.workWidth(),
old_first - text->first);
} else {
drawFromTo(text, bv,
owner.height() + old_first - text->first,
owner.height(), 0, 0, internal);
XCopyArea (fl_get_display(),
owner.getWin(),
owner.getWin(),
gc_copy,
owner.xpos(),
owner.ypos() + text->first - old_first,
owner.workWidth(),
owner.height() + old_first - text->first,
owner.xpos(),
owner.ypos());
// expose the area drawn
expose(0, owner.height() + old_first - text->first,
owner.workWidth(), text->first - old_first);
}
} else {
// make a dumb new-draw
drawFromTo(text, bv, 0, owner.height(), 0, 0, internal);
expose(0, 0, owner.workWidth(), owner.height());
}
}
void LyXScreen::showCursor(LyXText const * text, BufferView const * bv)
{
if (!cursor_visible) {
Cursor_Shape shape = BAR_SHAPE;
if (text->real_current_font.language() !=
bv->buffer()->params.language
|| text->real_current_font.isVisibleRightToLeft()
!= bv->buffer()->params.language->RightToLeft())
shape = (text->real_current_font.isVisibleRightToLeft())
? REVERSED_L_SHAPE : L_SHAPE;
showManualCursor(text, text->cursor.x(), text->cursor.y(),
lyxfont::maxAscent(text->real_current_font),
lyxfont::maxDescent(text->real_current_font),
shape);
}
}
/* returns true if first has changed, otherwise false */
bool LyXScreen::fitManualCursor(LyXText * text, BufferView * bv,
int /*x*/, int y, int asc, int desc)
{
int newtop = text->first;
if (y + desc - text->first >= static_cast<int>(owner.height()))
newtop = y - 3 * owner.height() / 4; // the scroll region must be so big!!
else if (y - asc < static_cast<int>(text->first)
&& text->first > 0) {
newtop = y - owner.height() / 4;
}
newtop = max(newtop, 0); // can newtop ever be < 0? (Lgb)
if (newtop != static_cast<int>(text->first)) {
draw(text, bv, newtop);
text->first = newtop;
return true;
}
return false;
}
void LyXScreen::showManualCursor(LyXText const * text, int x, int y,
int asc, int desc, Cursor_Shape shape)
{
// Update the cursor color.
setCursorColor();
int const y1 = max(y - text->first - asc, 0);
int const y_tmp = min(y - text->first + desc,
static_cast<int>(owner.height()));
// Secure against very strange situations
int const y2 = max(y_tmp, y1);
if (cursor_pixmap){
XFreePixmap(fl_get_display(), cursor_pixmap);
cursor_pixmap = 0;
}
if (y2 > 0 && y1 < int(owner.height())) {
cursor_pixmap_h = y2 - y1 + 1;
cursor_pixmap_y = y1;
switch (shape) {
case BAR_SHAPE:
cursor_pixmap_w = 1;
cursor_pixmap_x = x;
break;
case L_SHAPE:
cursor_pixmap_w = cursor_pixmap_h/3;
cursor_pixmap_x = x;
break;
case REVERSED_L_SHAPE:
cursor_pixmap_w = cursor_pixmap_h/3;
cursor_pixmap_x = x - cursor_pixmap_w + 1;
break;
}
cursor_pixmap =
XCreatePixmap (fl_get_display(),
fl_root,
cursor_pixmap_w,
cursor_pixmap_h,
fl_get_visual_depth());
XCopyArea (fl_get_display(),
owner.getWin(),
cursor_pixmap,
gc_copy,
owner.xpos() + cursor_pixmap_x,
owner.ypos() + cursor_pixmap_y,
cursor_pixmap_w,
cursor_pixmap_h,
0, 0);
XDrawLine(fl_get_display(),
owner.getWin(),
gc_copy,
x + owner.xpos(),
y1 + owner.ypos(),
x + owner.xpos(),
y2 + owner.ypos());
switch (shape) {
case BAR_SHAPE:
break;
case L_SHAPE:
case REVERSED_L_SHAPE:
int const rectangle_h = (cursor_pixmap_h + 10) / 20;
XFillRectangle(fl_get_display(),
owner.getWin(),
gc_copy,
cursor_pixmap_x + owner.xpos(),
y2 - rectangle_h + 1 + owner.ypos(),
cursor_pixmap_w - 1, rectangle_h);
break;
}
}
cursor_visible = true;
}
void LyXScreen::hideCursor()
{
if (!cursor_visible) return;
if (cursor_pixmap){
XCopyArea (fl_get_display(),
cursor_pixmap,
owner.getWin(),
gc_copy,
0, 0,
cursor_pixmap_w, cursor_pixmap_h,
cursor_pixmap_x + owner.xpos(),
cursor_pixmap_y + owner.ypos());
}
cursor_visible = false;
}
void LyXScreen::cursorToggle(BufferView * bv) const
{
if (cursor_visible)
bv->hideCursor();
else
bv->showCursor();
}
/* returns a new top so that the cursor is visible */
unsigned int LyXScreen::topCursorVisible(LyXText const * text)
{
int newtop = text->first;
if (text->cursor.y()
- text->cursor.row()->baseline()
+ text->cursor.row()->height()
- text->first >= owner.height()) {
if (text->cursor.row()->height() < owner.height()
&& text->cursor.row()->height() > owner.height() / 4)
newtop = text->cursor.y()
+ text->cursor.row()->height()
- text->cursor.row()->baseline() - owner.height();
else
newtop = text->cursor.y()
- 3 * owner.height() / 4; /* the scroll region must be so big!! */
} else if (static_cast<int>((text->cursor.y()) - text->cursor.row()->baseline()) <
text->first && text->first > 0)
{
if (text->cursor.row()->height() < owner.height()
&& text->cursor.row()->height() > owner.height() / 4)
newtop = text->cursor.y() - text->cursor.row()->baseline();
else {
newtop = text->cursor.y() - owner.height() / 4;
newtop = min(newtop, int(text->first));
}
}
newtop = max(newtop, 0);
return newtop;
}
/* scrolls the screen so that the cursor is visible, if necessary.
* returns true if a change was made, otherwise false */
bool LyXScreen::fitCursor(LyXText * text, BufferView * bv)
{
// Is a change necessary?
int const newtop = topCursorVisible(text);
bool const result = (newtop != text->first);
if (result)
draw(text, bv, newtop);
return result;
}
void LyXScreen::update(LyXText * text, BufferView * bv,
int y_offset, int x_offset)
{
switch (text->status()) {
case LyXText::NEED_MORE_REFRESH:
{
int const y = max(int(text->refresh_y - text->first), 0);
drawFromTo(text, bv, y, owner.height(), y_offset, x_offset);
text->refresh_y = 0;
// otherwise this is called ONLY from BufferView_pimpl(update)
// or we should see to set this flag accordingly
if (text != bv->text)
text->status(bv, LyXText::UNCHANGED);
expose(0, y, owner.workWidth(), owner.height() - y);
}
break;
case LyXText::NEED_VERY_LITTLE_REFRESH:
{
// ok I will update the current cursor row
drawOneRow(text, bv, text->refresh_row, text->refresh_y,
y_offset, x_offset);
// this because if we had a major update the refresh_row could
// have been set to 0!
if (text->refresh_row) {
// otherwise this is called ONLY from BufferView_pimpl(update)
// or we should see to set this flag accordingly
if (text != bv->text)
text->status(bv, LyXText::UNCHANGED);
expose(0, text->refresh_y - text->first + y_offset,
owner.workWidth(), text->refresh_row->height());
}
}
break;
case LyXText::CHANGED_IN_DRAW: // just to remove the warning
case LyXText::UNCHANGED:
// Nothing needs done
break;
}
}
void LyXScreen::toggleSelection(LyXText * text, BufferView * bv,
bool kill_selection,
int y_offset, int x_offset)
{
// only if there is a selection
if (!text->selection.set()) return;
int const bottom = min(
max(static_cast<int>(text->selection.end.y()
- text->selection.end.row()->baseline()
+ text->selection.end.row()->height()),
text->first),
static_cast<int>(text->first + owner.height()));
int const top = min(
max(static_cast<int>(text->selection.start.y() -
text->selection.start.row()->baseline()),
text->first),
static_cast<int>(text->first + owner.height()));
if (kill_selection)
text->selection.set(false);
drawFromTo(text, bv, top - text->first, bottom - text->first,
y_offset, x_offset);
expose(0, top - text->first,
owner.workWidth(),
bottom - text->first - (top - text->first));
}
void LyXScreen::toggleToggle(LyXText * text, BufferView * bv,
int y_offset, int x_offset)
{
if (text->toggle_cursor.par() == text->toggle_end_cursor.par()
&& text->toggle_cursor.pos() == text->toggle_end_cursor.pos())
return;
int const top_tmp = text->toggle_cursor.y()
- text->toggle_cursor.row()->baseline();
int const bottom_tmp = text->toggle_end_cursor.y()
- text->toggle_end_cursor.row()->baseline()
+ text->toggle_end_cursor.row()->height();
int const bottom = min(max(bottom_tmp, text->first),
static_cast<int>(text->first + owner.height()));
int const top = min(max(top_tmp, text->first),
static_cast<int>(text->first + owner.height()));
drawFromTo(text, bv, top - text->first, bottom - text->first, y_offset,
x_offset);
expose(0, top - text->first, owner.workWidth(),
bottom - text->first - (top - text->first));
}