118 lines
3.1 KiB
Go
118 lines
3.1 KiB
Go
// +build windows
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package winterm
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// effectiveSr gets the current effective scroll region in buffer coordinates
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func (h *windowsAnsiEventHandler) effectiveSr(window SMALL_RECT) scrollRegion {
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top := addInRange(window.Top, h.sr.top, window.Top, window.Bottom)
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bottom := addInRange(window.Top, h.sr.bottom, window.Top, window.Bottom)
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if top >= bottom {
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top = window.Top
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bottom = window.Bottom
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}
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return scrollRegion{top: top, bottom: bottom}
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}
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func (h *windowsAnsiEventHandler) scrollUp(param int) error {
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info, err := GetConsoleScreenBufferInfo(h.fd)
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if err != nil {
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return err
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}
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sr := h.effectiveSr(info.Window)
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return h.scroll(param, sr, info)
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}
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func (h *windowsAnsiEventHandler) scrollDown(param int) error {
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return h.scrollUp(-param)
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}
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func (h *windowsAnsiEventHandler) deleteLines(param int) error {
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info, err := GetConsoleScreenBufferInfo(h.fd)
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if err != nil {
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return err
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}
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start := info.CursorPosition.Y
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sr := h.effectiveSr(info.Window)
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// Lines cannot be inserted or deleted outside the scrolling region.
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if start >= sr.top && start <= sr.bottom {
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sr.top = start
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return h.scroll(param, sr, info)
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} else {
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return nil
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}
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}
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func (h *windowsAnsiEventHandler) insertLines(param int) error {
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return h.deleteLines(-param)
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}
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// scroll scrolls the provided scroll region by param lines. The scroll region is in buffer coordinates.
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func (h *windowsAnsiEventHandler) scroll(param int, sr scrollRegion, info *CONSOLE_SCREEN_BUFFER_INFO) error {
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h.logf("scroll: scrollTop: %d, scrollBottom: %d", sr.top, sr.bottom)
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h.logf("scroll: windowTop: %d, windowBottom: %d", info.Window.Top, info.Window.Bottom)
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// Copy from and clip to the scroll region (full buffer width)
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scrollRect := SMALL_RECT{
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Top: sr.top,
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Bottom: sr.bottom,
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Left: 0,
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Right: info.Size.X - 1,
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}
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// Origin to which area should be copied
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destOrigin := COORD{
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X: 0,
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Y: sr.top - int16(param),
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}
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char := CHAR_INFO{
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UnicodeChar: ' ',
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Attributes: h.attributes,
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}
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if err := ScrollConsoleScreenBuffer(h.fd, scrollRect, scrollRect, destOrigin, char); 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) deleteCharacters(param int) error {
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info, err := GetConsoleScreenBufferInfo(h.fd)
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if err != nil {
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return err
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}
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return h.scrollLine(param, info.CursorPosition, info)
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}
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func (h *windowsAnsiEventHandler) insertCharacters(param int) error {
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return h.deleteCharacters(-param)
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}
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// scrollLine scrolls a line horizontally starting at the provided position by a number of columns.
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func (h *windowsAnsiEventHandler) scrollLine(columns int, position COORD, info *CONSOLE_SCREEN_BUFFER_INFO) error {
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// Copy from and clip to the scroll region (full buffer width)
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scrollRect := SMALL_RECT{
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Top: position.Y,
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Bottom: position.Y,
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Left: position.X,
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Right: info.Size.X - 1,
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}
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// Origin to which area should be copied
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destOrigin := COORD{
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X: position.X - int16(columns),
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Y: position.Y,
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}
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char := CHAR_INFO{
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UnicodeChar: ' ',
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Attributes: h.attributes,
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}
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if err := ScrollConsoleScreenBuffer(h.fd, scrollRect, scrollRect, destOrigin, char); 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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