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桌面环境：UILib增加Dropdown和增加APP：UILib Gallery

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Leonmmcoset
2026-03-25 20:31:10 +08:00
parent a8ac9384c6
commit d009660918
5 changed files with 631 additions and 2 deletions
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305
Gui/UILib/Dropdown.cs Normal file
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using System;
using System.Collections.Generic;
using System.Drawing;
namespace CMLeonOS.Gui.UILib
{
internal class Dropdown : Control
{
internal Dropdown(Window parent, int x, int y, int width, int height) : base(parent, x, y, width, height)
{
hostWindow = parent;
OnClick = (_, _) => ToggleExpanded();
OnUnfocused = Collapse;
}
private readonly Window hostWindow;
private Window popupWindow;
private Table popupTable;
internal Action<int, string> SelectionChanged;
internal List<string> Items { get; } = new List<string>();
private string _placeholderText = "Select";
internal string PlaceholderText
{
get
{
return _placeholderText;
}
set
{
_placeholderText = value ?? string.Empty;
Render();
}
}
private Color _background = UITheme.Surface;
internal Color Background
{
get
{
return _background;
}
set
{
_background = value;
Render();
}
}
private Color _foreground = UITheme.TextPrimary;
internal Color Foreground
{
get
{
return _foreground;
}
set
{
_foreground = value;
Render();
}
}
private Color _border = UITheme.SurfaceBorder;
internal Color Border
{
get
{
return _border;
}
set
{
_border = value;
Render();
}
}
private Color _highlight = UITheme.Accent;
internal Color Highlight
{
get
{
return _highlight;
}
set
{
_highlight = value;
Render();
}
}
private int _selectedIndex = -1;
internal int SelectedIndex
{
get
{
return _selectedIndex;
}
set
{
int newIndex = value;
if (newIndex < -1)
{
newIndex = -1;
}
if (newIndex >= Items.Count)
{
newIndex = Items.Count - 1;
}
if (_selectedIndex != newIndex)
{
_selectedIndex = newIndex;
Render();
SyncPopupSelection();
}
}
}
internal string SelectedText
{
get
{
if (_selectedIndex < 0 || _selectedIndex >= Items.Count)
{
return string.Empty;
}
return Items[_selectedIndex];
}
}
internal bool Expanded { get; private set; } = false;
internal int MaxVisibleItems { get; set; } = 6;
internal void RefreshItems()
{
if (_selectedIndex >= Items.Count)
{
_selectedIndex = Items.Count - 1;
}
RebuildPopup();
Render();
}
private void ToggleExpanded()
{
if (Expanded)
{
Collapse();
}
else
{
Expand();
}
}
private void Expand()
{
if (Expanded)
{
return;
}
Expanded = true;
RebuildPopup();
Render();
}
internal void Collapse()
{
if (!Expanded)
{
return;
}
Expanded = false;
if (popupTable != null)
{
WM.RemoveWindow(popupTable);
popupTable = null;
}
if (popupWindow != null)
{
WM.RemoveWindow(popupWindow);
popupWindow = null;
}
Render();
}
private void PopupSelected(int index)
{
if (index < 0 || index >= Items.Count)
{
return;
}
_selectedIndex = index;
Collapse();
Render();
SelectionChanged?.Invoke(_selectedIndex, Items[_selectedIndex]);
}
private void SyncPopupSelection()
{
if (popupTable != null)
{
popupTable.SelectedCellIndex = _selectedIndex;
}
}
private void RebuildPopup()
{
if (!Expanded)
{
return;
}
if (popupTable != null)
{
WM.RemoveWindow(popupTable);
popupTable = null;
}
if (popupWindow != null)
{
WM.RemoveWindow(popupWindow);
popupWindow = null;
}
int visibleItems = Math.Max(1, Math.Min(MaxVisibleItems, Math.Max(1, Items.Count)));
int popupHeight = Math.Max(24, visibleItems * 22);
popupWindow = new Window(Process, hostWindow, X, Y + Height, Width, popupHeight);
popupWindow.Clear(UITheme.Surface);
popupWindow.DrawRectangle(0, 0, popupWindow.Width, popupWindow.Height, Border);
WM.AddWindow(popupWindow);
popupTable = new Table(popupWindow, 0, 0, popupWindow.Width, popupWindow.Height);
popupTable.AllowDeselection = false;
popupTable.CellHeight = 22;
popupTable.Background = UITheme.Surface;
popupTable.Foreground = Foreground;
popupTable.Border = Border;
popupTable.SelectedBackground = UITheme.AccentLight;
popupTable.SelectedBorder = Highlight;
popupTable.SelectedForeground = Foreground;
popupTable.TableCellSelected = PopupSelected;
for (int i = 0; i < Items.Count; i++)
{
popupTable.Cells.Add(new TableCell(Items[i], i));
}
popupTable.SelectedCellIndex = _selectedIndex;
popupTable.Render();
WM.AddWindow(popupTable);
}
internal override void Render()
{
Clear(Background);
DrawFilledRectangle(0, 0, Width, Height, Background);
Color frame = Expanded ? Highlight : Border;
DrawRectangle(0, 0, Width, Height, frame);
string displayText = SelectedIndex >= 0 ? SelectedText : PlaceholderText;
Color textColor = SelectedIndex >= 0 ? Foreground : UITheme.TextSecondary;
int maxChars = Math.Max(1, (Width - 24) / 8);
if (displayText.Length > maxChars)
{
displayText = displayText.Substring(0, Math.Max(1, maxChars - 1)) + "~";
}
DrawString(displayText, textColor, 6, (Height / 2) - 8);
int arrowCenterX = Width - 12;
int arrowCenterY = Height / 2;
DrawLine(arrowCenterX - 4, arrowCenterY - 2, arrowCenterX, arrowCenterY + 2, textColor);
DrawLine(arrowCenterX, arrowCenterY + 2, arrowCenterX + 4, arrowCenterY - 2, textColor);
if (Expanded && popupWindow != null)
{
popupWindow.MoveAndResize(X, Y + Height, Width, popupWindow.Height, sendWMEvent: false);
if (popupTable != null)
{
popupTable.MoveAndResize(0, 0, popupWindow.Width, popupWindow.Height, sendWMEvent: false);
popupTable.Render();
}
popupWindow.Clear(UITheme.Surface);
popupWindow.DrawRectangle(0, 0, popupWindow.Width, popupWindow.Height, Border);
WM.Update(popupWindow);
}
WM.Update(this);
}
}
}