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better scrollbar support

This commit is contained in:
Vadim Lopatin 2014-06-09 11:09:09 +04:00
parent a488efaa15
commit a283ebd307
1 changed files with 50 additions and 15 deletions
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65
src/dlangui/widgets/grid.d
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@ -366,21 +366,21 @@ class GridWidgetBase : WidgetGroup, OnScrollHandler {
void scrollTo(int col, int row) {
int newScrollCol = col - _headerCols - _fixedCols;
int newScrollRow = row - _headerRows - _fixedRows;
bool changed = false;
//bool changed = false;
if (newScrollCol >= 0 && newScrollCol + _headerCols + _fixedCols < _cols) {
if (_scrollCol != newScrollCol) {
_scrollCol = newScrollCol;
changed = true;
//changed = true;
}
}
if (newScrollRow >= 0 && newScrollRow + _headerRows + _fixedRows < _rows) {
if (_scrollRow != newScrollRow) {
_scrollRow = newScrollRow;
changed = true;
//changed = true;
}
}
if (changed)
updateScrollBars();
//if (changed)
updateScrollBars();
}
/// handle scroll event
@ -525,6 +525,15 @@ class GridWidgetBase : WidgetGroup, OnScrollHandler {
}
yy += w;
}
int maxVisibleScrollWidth = _clientRect.width - fullyVisibleCellsRect.left;
int maxVisibleScrollHeight = _clientRect.height - fullyVisibleCellsRect.top;
if (maxVisibleScrollWidth < 0)
maxVisibleScrollWidth = 0;
if (maxVisibleScrollHeight < 0)
maxVisibleScrollHeight = 0;
// calc scroll area in pixels
xx = 0;
for (int i = 0; i < _cols; i++) {
@ -543,6 +552,15 @@ class GridWidgetBase : WidgetGroup, OnScrollHandler {
visibleScrollableArea.right = xx;
}
}
xx = 0;
for (int i = _cols - 1; i >= _headerCols + _fixedCols; i--) {
int w = _colWidths[i];
if (xx + w > maxVisibleScrollWidth) {
fullScrollableArea.right += maxVisibleScrollWidth - xx;
break;
}
xx += w;
}
yy = 0;
for (int i = 0; i < _rows; i++) {
if (i == _headerRows + _fixedRows) {
@ -560,17 +578,20 @@ class GridWidgetBase : WidgetGroup, OnScrollHandler {
visibleScrollableArea.bottom = yy;
}
}
yy = 0;
for (int i = _rows - 1; i >= _headerRows + _fixedRows; i--) {
int w = _rowHeights[i];
if (yy + w > maxVisibleScrollHeight) {
fullScrollableArea.bottom += maxVisibleScrollHeight - yy;
break;
}
yy += w;
}
// crop scroll area by client rect
int maxVisibleScrollWidth = _clientRect.width - fullyVisibleCellsRect.left;
int maxVisibleScrollHeight = _clientRect.height - fullyVisibleCellsRect.top;
if (maxVisibleScrollWidth < 0)
maxVisibleScrollWidth = 0;
if (maxVisibleScrollHeight < 0)
maxVisibleScrollHeight = 0;
if (visibleScrollableArea.width > maxVisibleScrollWidth)
visibleScrollableArea.right = visibleScrollableArea.left + maxVisibleScrollWidth;
if (visibleScrollableArea.height > maxVisibleScrollHeight)
visibleScrollableArea.bottom = visibleScrollableArea.top + maxVisibleScrollHeight;
//if (visibleScrollableArea.width > maxVisibleScrollWidth)
visibleScrollableArea.right = visibleScrollableArea.left + maxVisibleScrollWidth;
//if (visibleScrollableArea.height > maxVisibleScrollHeight)
visibleScrollableArea.bottom = visibleScrollableArea.top + maxVisibleScrollHeight;
}
protected Rect _fullyVisibleCells;
@ -610,10 +631,24 @@ class GridWidgetBase : WidgetGroup, OnScrollHandler {
selectCell(_col, _row + 1);
return true;
case GridActions.ScrollPageLeft:
// scroll left cell by cell
int prevCol = _headerCols + _fixedCols + _scrollCol;
while (_scrollCol > 0) {
scrollBy(-1, 0);
if (_fullyVisibleCells.right <= prevCol)
break;
}
return true;
case GridActions.ScrollPageRight:
return true;
case GridActions.ScrollPageUp:
// scroll up line by line
int prevRow = _headerRows + _fixedRows + _scrollRow;
while (_scrollRow > 0) {
scrollBy(0, -1);
if (_fullyVisibleCells.bottom <= prevRow)
break;
}
return true;
case GridActions.ScrollPageDown:
return true;