338 lines
13 KiB
C#
338 lines
13 KiB
C#
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using System;
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using System.Collections.Generic;
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using Microsoft.Xna.Framework;
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using Microsoft.Xna.Framework.Graphics;
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namespace FarseerPhysics.SamplesFramework
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{
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/// <summary>
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/// Base class for screens that contain a menu of options. The user can
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/// move up and down to select an entry, or cancel to back out of the screen.
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/// </summary>
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public class MenuScreen : GameScreen
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{
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#if WINDOWS || XBOX
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protected const float NumEntries = 15;
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#elif WINDOWS_PHONE
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protected const float NumEntries = 9;
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#endif
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protected List<MenuEntry> _menuEntries = new List<MenuEntry>();
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protected string _menuTitle;
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protected Vector2 _titlePosition;
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protected Vector2 _titleOrigin;
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protected int _selectedEntry;
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protected float _menuBorderTop;
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protected float _menuBorderBottom;
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protected float _menuBorderMargin;
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protected float _menuOffset;
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protected float _maxOffset;
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protected Texture2D _texScrollButton;
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protected Texture2D _texSlider;
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protected MenuButton _scrollUp;
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protected MenuButton _scrollDown;
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protected MenuButton _scrollSlider;
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protected bool _scrollLock;
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/// <summary>
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/// Constructor.
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/// </summary>
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public MenuScreen(string menuTitle)
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{
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_menuTitle = menuTitle;
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TransitionOnTime = TimeSpan.FromSeconds(0.7);
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TransitionOffTime = TimeSpan.FromSeconds(0.7);
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HasCursor = true;
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}
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public void AddMenuItem(string name, EntryType type, GameScreen screen)
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{
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MenuEntry entry = new MenuEntry(this, name, type, screen);
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_menuEntries.Add(entry);
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}
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public void AddMenuItem(MenuEntry me)
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{
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_menuEntries.Add(me);
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}
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public override void LoadContent()
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{
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base.LoadContent();
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_texScrollButton = ScreenManager.Content.Load<Texture2D>("Common/arrow");
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_texSlider = ScreenManager.Content.Load<Texture2D>("Common/slider");
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//Viewport viewport = ScreenManager.GraphicsDevice.Viewport;
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//float scrollBarPos = viewport.Width / 2f;
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//scrollBarPos -= _texScrollButton.Width + 2f;
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InitMenu();
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}
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public void InitMenu()
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{
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Viewport viewport = ScreenManager.GraphicsDevice.Viewport;
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SpriteFont font = ScreenManager.Fonts.MenuSpriteFont;
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float scrollBarPos = viewport.Width / 2f;
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for (int i = 0; i < _menuEntries.Count; ++i)
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{
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_menuEntries[i].Initialize();
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scrollBarPos = Math.Min(scrollBarPos,
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(viewport.Width - _menuEntries[i].GetWidth()) / 2f);
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}
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_titleOrigin = font.MeasureString(_menuTitle) / 2f;
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_titlePosition = new Vector2(viewport.Width / 2f, font.MeasureString("M").Y / 2f + 10f);
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_menuBorderMargin = font.MeasureString("M").Y * 0.8f;
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_menuBorderTop = (viewport.Height - _menuBorderMargin * (NumEntries - 1)) / 2f;
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_menuBorderBottom = (viewport.Height + _menuBorderMargin * (NumEntries - 1)) / 2f;
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_menuOffset = 0f;
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_maxOffset = Math.Max(0f, (_menuEntries.Count - NumEntries) * _menuBorderMargin);
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_scrollUp = new MenuButton(_texScrollButton, false,
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new Vector2(scrollBarPos, _menuBorderTop - _texScrollButton.Height), this);
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_scrollDown = new MenuButton(_texScrollButton, true,
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new Vector2(scrollBarPos, _menuBorderBottom + _texScrollButton.Height), this);
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_scrollSlider = new MenuButton(_texSlider, false, new Vector2(scrollBarPos, _menuBorderTop), this);
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_scrollLock = false;
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}
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/// <summary>
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/// Returns the index of the menu entry at the position of the given mouse state.
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/// </summary>
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/// <returns>Index of menu entry if valid, -1 otherwise</returns>
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private int GetMenuEntryAt(Vector2 position)
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{
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if (this.TransitionPosition == 0f && this.ScreenState == SamplesFramework.ScreenState.Active)
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{
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int index = 0;
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foreach (MenuEntry entry in _menuEntries)
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{
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float width = entry.GetWidth();
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float height = entry.GetHeight();
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Rectangle rect = new Rectangle((int)(entry.Position.X - width / 2f),
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(int)(entry.Position.Y - height / 2f),
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(int)width, (int)height);
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if (rect.Contains((int)position.X, (int)position.Y) && entry.Alpha > 0.1f)
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{
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return index;
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}
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++index;
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}
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}
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return -1;
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}
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/// <summary>
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/// Responds to user input, changing the selected entry and accepting
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/// or cancelling the menu.
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/// </summary>
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public override void HandleInput(InputHelper input, GameTime gameTime)
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{
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// Mouse or touch on a menu item
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int hoverIndex = GetMenuEntryAt(input.Cursor);
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if (hoverIndex > -1 && _menuEntries[hoverIndex].IsSelectable() && !_scrollLock)
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{
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_selectedEntry = hoverIndex;
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}
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else
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{
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_selectedEntry = -1;
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}
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_scrollSlider.Hover = false;
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if (input.IsCursorValid)
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{
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_scrollUp.Collide(input.Cursor);
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_scrollDown.Collide(input.Cursor);
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_scrollSlider.Collide(input.Cursor);
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}
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else
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{
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_scrollUp.Hover = false;
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_scrollDown.Hover = false;
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_scrollLock = false;
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}
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// Accept or cancel the menu?
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if (input.IsMenuSelect() && _selectedEntry != -1)
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{
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if (_menuEntries[_selectedEntry].IsExitItem())
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{
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ScreenManager.Game.Exit();
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}
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else if (_menuEntries[_selectedEntry].IsBackItem())
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{
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this.ExitScreen();
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}
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else if (_menuEntries[_selectedEntry].Screen != null)
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{
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ScreenManager.AddScreen(_menuEntries[_selectedEntry].Screen);
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if (_menuEntries[_selectedEntry].Screen is IDemoScreen)
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{
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ScreenManager.AddScreen(
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new MessageBoxScreen((_menuEntries[_selectedEntry].Screen as IDemoScreen).GetDetails()));
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}
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}
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}
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else if (input.IsMenuCancel())
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{
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if (this.ScreenState == SamplesFramework.ScreenState.Active)
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{
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if (ScreenManager.GetScreens().Length == 2)
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ScreenManager.Game.Exit();
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else
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this.ExitScreen();
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}
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//ScreenManager.Game.Exit();
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}
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if (input.IsMenuPressed())
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{
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if (_scrollUp.Hover)
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{
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_menuOffset = Math.Max(_menuOffset - 200f * (float)gameTime.ElapsedGameTime.TotalSeconds, 0f);
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_scrollLock = false;
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}
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if (_scrollDown.Hover)
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{
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_menuOffset = Math.Min(_menuOffset + 200f * (float)gameTime.ElapsedGameTime.TotalSeconds, _maxOffset);
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_scrollLock = false;
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}
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if (_scrollSlider.Hover)
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{
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_scrollLock = true;
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}
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}
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if (input.IsMenuReleased())
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{
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_scrollLock = false;
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}
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if (_scrollLock)
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{
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_scrollSlider.Hover = true;
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_menuOffset = Math.Max(Math.Min(((input.Cursor.Y - _menuBorderTop) / (_menuBorderBottom - _menuBorderTop)) * _maxOffset, _maxOffset), 0f);
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}
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}
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/// <summary>
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/// Allows the screen the chance to position the menu entries. By default
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/// all menu entries are lined up in a vertical list, centered on the screen.
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/// </summary>
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protected virtual void UpdateMenuEntryLocations()
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{
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// Make the menu slide into place during transitions, using a
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// power curve to make things look more interesting (this makes
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// the movement slow down as it nears the end).
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float transitionOffset = (float)Math.Pow(TransitionPosition, 2);
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Vector2 position = Vector2.Zero;
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position.Y = _menuBorderTop - _menuOffset;
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// update each menu entry's location in turn
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for (int i = 0; i < _menuEntries.Count; ++i)
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{
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position.X = ScreenManager.GraphicsDevice.Viewport.Width / 2f;
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if (ScreenState == ScreenState.TransitionOn)
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{
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position.X -= transitionOffset * 256;
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}
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else
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{
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position.X += transitionOffset * 256;
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}
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// set the entry's position
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_menuEntries[i].Position = position;
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if (position.Y < _menuBorderTop)
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{
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_menuEntries[i].Alpha = 1f -
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Math.Min(_menuBorderTop - position.Y, _menuBorderMargin) / _menuBorderMargin;
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}
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else if (position.Y > _menuBorderBottom)
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{
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_menuEntries[i].Alpha = 1f -
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Math.Min(position.Y - _menuBorderBottom, _menuBorderMargin) /
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_menuBorderMargin;
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}
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else
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{
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_menuEntries[i].Alpha = 1f;
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}
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// move down for the next entry the size of this entry
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position.Y += _menuEntries[i].GetHeight();
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}
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Vector2 scrollPos = _scrollSlider.Position;
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scrollPos.Y = MathHelper.Lerp(_menuBorderTop, _menuBorderBottom, _menuOffset / _maxOffset);
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_scrollSlider.Position = scrollPos;
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}
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/// <summary>
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/// Updates the menu.
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/// </summary>
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public override void Update(GameTime gameTime, bool otherScreenHasFocus,
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bool coveredByOtherScreen)
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{
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base.Update(gameTime, otherScreenHasFocus, coveredByOtherScreen);
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// Update each nested MenuEntry object.
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for (int i = 0; i < _menuEntries.Count; ++i)
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{
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bool isSelected = IsActive && (i == _selectedEntry);
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_menuEntries[i].Update(isSelected, gameTime);
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}
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_scrollUp.Update(gameTime);
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_scrollDown.Update(gameTime);
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_scrollSlider.Update(gameTime);
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}
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/// <summary>
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/// Draws the menu.
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/// </summary>
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public override void Draw(GameTime gameTime)
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{
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// make sure our entries are in the right place before we draw them
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UpdateMenuEntryLocations();
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SpriteBatch spriteBatch = ScreenManager.SpriteBatch;
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SpriteFont font = ScreenManager.Fonts.MenuSpriteFont;
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spriteBatch.Begin();
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// Draw each menu entry in turn.
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for (int i = 0; i < _menuEntries.Count; ++i)
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{
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bool isSelected = IsActive && (i == _selectedEntry);
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_menuEntries[i].Draw();
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}
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// Make the menu slide into place during transitions, using a
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// power curve to make things look more interesting (this makes
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// the movement slow down as it nears the end).
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Vector2 transitionOffset = new Vector2(0f, (float)Math.Pow(TransitionPosition, 2) * 100f);
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spriteBatch.DrawString(font, _menuTitle, _titlePosition - transitionOffset + Vector2.One * 2f, Color.Black, 0,
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_titleOrigin, 1f, SpriteEffects.None, 0);
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spriteBatch.DrawString(font, _menuTitle, _titlePosition - transitionOffset, new Color(255, 210, 0), 0,
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_titleOrigin, 1f, SpriteEffects.None, 0);
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_scrollUp.Draw();
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_scrollSlider.Draw();
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_scrollDown.Draw();
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spriteBatch.End();
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}
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}
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}
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