protected override void OnPaint(PaintEventArgs e)
{
base.OnPaint(e);
// Setup drawing area
var viewRect = GetViewRect();
if (viewRect.X != 0 || viewRect.Y != 0)
{
// Set the graphics transform and reset the view rectangle,
// so the whole drawing is based on (0,0) point
e.Graphics.TranslateTransform(viewRect.X, viewRect.Y);
viewRect.X = viewRect.Y = 0;
}
// Draw background
using (var brush = new SolidBrush(CellBackColor))
e.Graphics.FillRectangle(brush, viewRect);
// Draw cells
if (source != null)
{
using (var userBrush = new SolidBrush(UserCellForeColor))
using (var fixedBrush = new SolidBrush(FixedCellForeColor))
using (var format = new StringFormat {
Alignment = StringAlignment.Center, LineAlignment = StringAlignment.Center
})
{
var font = this.Font;
for (int row = 0; row < 9; row++)
{
for (int col = 0; col < 9; col++)
{
var value = source.GetCellValue(row, col);
if (value == null)
{
continue;
}
var text = value.ToString();
var brush = !source.IsReady || source.IsCellFixed(row, col) ? fixedBrush : userBrush;
var rect = GetBaseCellRect(row, col);
e.Graphics.DrawString(text, font, brush, rect, format);
}
}
}
}
// Draw grid
using (var thinPen = new Pen(CellBorderColor, 1))
using (var thickPen = new Pen(CellBorderColor, 3))
{
// Draw grid lines
for (int i = 1; i < 9; i++)
{
var pen = (i % 3) == 0 ? thickPen : thinPen;
int pos = i * CellSize;
// Draw horizontal line at x = pos
e.Graphics.DrawLine(pen, 0, pos, viewRect.Right, pos);
// Draw vertical line at y = pos
e.Graphics.DrawLine(pen, pos, 0, pos, viewRect.Bottom);
}
// Draw grid border
e.Graphics.DrawRectangle(thickPen, viewRect);
}
// Draw selection rectangle
using (var pen = new Pen(SelectedCellBorderColor, 2))
{
var cellRect = GetBaseCellRect(selectedRow, selectedCol);
cellRect.Inflate(-1, -1);
e.Graphics.DrawRectangle(pen, cellRect);
}
}
public override bool CanExecute(PuzzleViewModel target) => oldValue != newValue && (!target.IsReady || !target.IsCellFixed(cell));
