stefankoelle/marcer-gamedvd-launcher
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stefankoelle
2026-08-10 20:20:27 +02:00
parent 715c0d98c5
commit 00a7ea26d6
18 changed files with 43 additions and 41 deletions
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MarcerGameDvdLauncher/NavigationController.cs
+110
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namespace MarcerGameDvdLauncher
{
public class NavigationController
{
public int SelectedIndex { get; private set; } = 0;
public int ScrollOffset { get; private set; } = 0;
public string CurrentRelativePath { get; private set; } = "";
// Stores the last selection & scroll position for each directory
private readonly Dictionary<string, (int sel, int scroll)> _lastSelections = new();
public void ResetSelection()
{
SelectedIndex = 0;
ScrollOffset = 0;
}
public void SetEntriesCount(int count)
{
if (SelectedIndex >= count || SelectedIndex < 0) ResetSelection();
if (ScrollOffset > count - 1) ScrollOffset = Math.Max(0, count - 1);
}
public bool MoveUp(List<GameEntry> entries, int availableLines)
{
int oldScroll = ScrollOffset;
if (SelectedIndex > 0) SelectedIndex--;
UpdateScrollOffset(entries.Count, availableLines);
return oldScroll != ScrollOffset;
}
public bool MoveDown(List<GameEntry> entries, int availableLines)
{
int oldScroll = ScrollOffset;
if (SelectedIndex < entries.Count - 1) SelectedIndex++;
UpdateScrollOffset(entries.Count, availableLines);
return oldScroll != ScrollOffset;
}
public void PageUp(List<GameEntry> entries, int availableLines)
{
if (entries.Count == 0) return;
int newSelected = SelectedIndex - availableLines;
if (newSelected < 0) newSelected = 0;
SelectedIndex = newSelected;
UpdateScrollOffset(entries.Count, availableLines);
}
public void PageDown(List<GameEntry> entries, int availableLines)
{
if (entries.Count == 0) return;
int newSelected = SelectedIndex + availableLines;
if (newSelected >= entries.Count) newSelected = entries.Count - 1;
SelectedIndex = newSelected;
UpdateScrollOffset(entries.Count, availableLines);
}
public void HandleEnter(List<GameEntry> entries)
{
if (entries.Count == 0) return;
var entry = entries[SelectedIndex];
if (entry.Kind == EntryKind.Directory)
{
_lastSelections[CurrentRelativePath] = (SelectedIndex, ScrollOffset);
CurrentRelativePath = Path.Combine(CurrentRelativePath, entry.Name);
if (_lastSelections.TryGetValue(CurrentRelativePath, out var tuple))
{
SelectedIndex = tuple.sel;
ScrollOffset = tuple.scroll;
}
else
{
ResetSelection();
}
}
// Actual file launch is still caller's responsibility!
}
public void GoUpDirectory()
{
if (string.IsNullOrEmpty(CurrentRelativePath)) return;
_lastSelections[CurrentRelativePath] = (SelectedIndex, ScrollOffset);
CurrentRelativePath = Path.GetDirectoryName(CurrentRelativePath) ?? "";
if (_lastSelections.TryGetValue(CurrentRelativePath, out var tuple))
{
SelectedIndex = tuple.sel;
ScrollOffset = tuple.scroll;
}
else
{
ResetSelection();
}
}
public void UpdateScrollOffset(int entryCount, int availableLines)
{
if (availableLines < 1) availableLines = 1;
if (entryCount <= availableLines) { ScrollOffset = 0; return; }
if (SelectedIndex == 0) { ScrollOffset = 0; return; }
int bottomScrollTrigger = ScrollOffset + (int)(availableLines * 2 / 3.0);
int topScrollTrigger = ScrollOffset + (int)(availableLines * 1 / 3.0);
if (SelectedIndex >= bottomScrollTrigger && (ScrollOffset + availableLines) < entryCount)
ScrollOffset = SelectedIndex - (int)(availableLines * 2 / 3.0);
else if (SelectedIndex < topScrollTrigger && ScrollOffset > 0)
ScrollOffset = SelectedIndex - (int)(availableLines * 1 / 3.0);
if (ScrollOffset < 0) ScrollOffset = 0;
if (ScrollOffset > entryCount - availableLines)
ScrollOffset = entryCount - availableLines;
}
}
}