84 lines
1.8 KiB
Go
84 lines
1.8 KiB
Go
// +build windows
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package winterm
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import "github.com/Azure/go-ansiterm"
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func (h *windowsAnsiEventHandler) clearRange(attributes uint16, fromCoord COORD, toCoord COORD) error {
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// Ignore an invalid (negative area) request
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if toCoord.Y < fromCoord.Y {
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return nil
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}
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var err error
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var coordStart = COORD{}
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var coordEnd = COORD{}
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xCurrent, yCurrent := fromCoord.X, fromCoord.Y
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xEnd, yEnd := toCoord.X, toCoord.Y
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// Clear any partial initial line
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if xCurrent > 0 {
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coordStart.X, coordStart.Y = xCurrent, yCurrent
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coordEnd.X, coordEnd.Y = xEnd, yCurrent
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err = h.clearRect(attributes, coordStart, coordEnd)
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if err != nil {
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return err
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}
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xCurrent = 0
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yCurrent += 1
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}
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// Clear intervening rectangular section
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if yCurrent < yEnd {
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coordStart.X, coordStart.Y = xCurrent, yCurrent
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coordEnd.X, coordEnd.Y = xEnd, yEnd-1
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err = h.clearRect(attributes, coordStart, coordEnd)
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if err != nil {
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return err
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}
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xCurrent = 0
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yCurrent = yEnd
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}
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// Clear remaining partial ending line
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coordStart.X, coordStart.Y = xCurrent, yCurrent
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coordEnd.X, coordEnd.Y = xEnd, yEnd
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err = h.clearRect(attributes, coordStart, coordEnd)
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if err != nil {
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return err
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}
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return nil
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}
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func (h *windowsAnsiEventHandler) clearRect(attributes uint16, fromCoord COORD, toCoord COORD) error {
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region := SMALL_RECT{Top: fromCoord.Y, Left: fromCoord.X, Bottom: toCoord.Y, Right: toCoord.X}
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width := toCoord.X - fromCoord.X + 1
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height := toCoord.Y - fromCoord.Y + 1
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size := uint32(width) * uint32(height)
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if size <= 0 {
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return nil
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}
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buffer := make([]CHAR_INFO, size)
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char := CHAR_INFO{ansiterm.FILL_CHARACTER, attributes}
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for i := 0; i < int(size); i++ {
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buffer[i] = char
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}
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err := WriteConsoleOutput(h.fd, buffer, COORD{X: width, Y: height}, COORD{X: 0, Y: 0}, ®ion)
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if err != nil {
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return err
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}
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return nil
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}
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