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Pageupdown (#138)

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* feat(text view pageup/down): Added code to process `PageUp` and `PageDown` keys in the `TextView`.

* fix(text view pageup/down): Corrected the functionality of the `PageUp` so that it can go till row 1
This commit is contained in:
orion
2018-10-10 13:35:40 -04:00
committed by Miguel de Icaza
parent bb1e050cd4
commit cb5a08cbff
1 changed files with 54 additions and 13 deletions
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67
Terminal.Gui/Views/TextView.cs
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@@ -6,7 +6,6 @@
//
//
// TODO:
// PageUp/PageDown
// In ReadOnly mode backspace/space behave like pageup/pagedown
// Attributed text on spans
// Replace insertion with Insert method
@@ -113,8 +112,9 @@ namespace Terminal.Gui {
public override string ToString ()
{
var sb = new StringBuilder ();
foreach (var line in lines) {
sb.Append (ustring.Make (line).ToString ());
foreach (var line in lines)
{
sb.Append (ustring.Make(line));
sb.AppendLine ();
}
return sb.ToString ();
@@ -130,7 +130,7 @@ namespace Terminal.Gui {
/// </summary>
/// <returns>The line.</returns>
/// <param name="line">Line number to retrieve.</param>
public List<Rune> GetLine (int line) => lines [line];
public List<Rune> GetLine (int line) => line < Count ? lines [line]: lines[Count-1];
/// <summary>
/// Adds a line to the model at the specified position.
@@ -392,7 +392,12 @@ namespace Terminal.Gui {
Driver.SetAttribute (ColorScheme.Normal);
}
bool isReadOnly;
bool isReadOnly = false;
/// <summary>
/// Indicates readonly attribute of TextView
/// </summary>
/// <value>Boolean value(Default false)</value>
public bool ReadOnly {
get => isReadOnly;
set {
@@ -494,22 +499,26 @@ namespace Terminal.Gui {
int bottom = region.Bottom;
int right = region.Right;
for (int row = region.Top; row < bottom; row++) {
for (int row = region.Top; row < bottom; row++)
{
int textLine = topRow + row;
if (textLine >= model.Count) {
if (textLine >= model.Count)
{
ColorNormal ();
ClearRegion (region.Left, row, region.Right, row + 1);
continue;
}
var line = model.GetLine (textLine);
int lineRuneCount = line.Count;
if (line.Count < region.Left){
if (line.Count < region.Left)
{
ClearRegion (region.Left, row, region.Right, row + 1);
continue;
}
Move (region.Left, row);
for (int col = region.Left; col < right; col++) {
for (int col = region.Left; col < right; col++)
{
var lineCol = leftColumn + col;
var rune = lineCol >= lineRuneCount ? ' ' : line [lineCol];
if (selecting && PointInSelection (col, row))
@@ -682,6 +691,38 @@ namespace Terminal.Gui {
// Dispatch the command.
switch (kb.Key) {
case Key.PageDown:
case Key.ControlV:
int nPageDnShift = Frame.Height - 1;
if (currentRow < model.Count) {
if (columnTrack == -1)
columnTrack = currentColumn;
currentRow = (currentRow + nPageDnShift) > model.Count ? model.Count : currentRow + nPageDnShift;
if (topRow < currentRow - nPageDnShift) {
topRow = currentRow >= model.Count ? currentRow - nPageDnShift : topRow + nPageDnShift;
SetNeedsDisplay ();
}
TrackColumn ();
PositionCursor ();
}
break;
case Key.PageUp:
case ((int)'v' + Key.AltMask):
int nPageUpShift = Frame.Height - 1;
if (currentRow > 0) {
if (columnTrack == -1)
columnTrack = currentColumn;
currentRow = currentRow - nPageUpShift < 0 ? 0 : currentRow - nPageUpShift;
if (currentRow < topRow) {
topRow = topRow - nPageUpShift < 0 ? 0 : topRow - nPageUpShift;
SetNeedsDisplay ();
}
TrackColumn ();
PositionCursor ();
}
break;
case Key.ControlN:
case Key.CursorDown:
if (currentRow + 1 < model.Count) {
@@ -938,11 +979,12 @@ namespace Terminal.Gui {
break;
default:
if (isReadOnly)
return true;
// Ignore control characters and other special keys
if (kb.Key < Key.Space || kb.Key > Key.CharMask)
return false;
//So that special keys like tab can be processed
if (isReadOnly)
return true;
Insert ((uint)kb.Key);
currentColumn++;
if (currentColumn >= leftColumn + Frame.Width) {
@@ -1109,5 +1151,4 @@ namespace Terminal.Gui {
}
}
}
}