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345
app/WindowsDisplayAPI/DisplaySetting.cs
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345
app/WindowsDisplayAPI/DisplaySetting.cs
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using System;
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using System.Collections.Generic;
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using System.Drawing;
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using System.Linq;
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using WindowsDisplayAPI.Exceptions;
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using WindowsDisplayAPI.Native;
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using WindowsDisplayAPI.Native.DeviceContext;
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using WindowsDisplayAPI.Native.DeviceContext.Structures;
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using WindowsDisplayAPI.Native.Structures;
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namespace WindowsDisplayAPI
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{
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/// <summary>
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/// Holds configurations of a windows display
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/// </summary>
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public class DisplaySetting : DisplayPossibleSetting
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{
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/// <summary>
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/// Creates a new <see cref="DisplaySetting" /> instance.
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/// </summary>
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/// <param name="validSetting">The basic configuration information object</param>
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/// <param name="position">Display position on desktop</param>
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public DisplaySetting(DisplayPossibleSetting validSetting, Point position = default)
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: this(validSetting, position, DisplayOrientation.Identity, DisplayFixedOutput.Default)
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{
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}
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/// <summary>
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/// Creates a new <see cref="DisplaySetting" /> instance.
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/// </summary>
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/// <param name="validSetting">The basic configuration information object</param>
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/// <param name="position">Display position on desktop</param>
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/// <param name="orientation">Display orientation and rotation</param>
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/// <param name="outputScalingMode">
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/// Display output behavior in case of presenting a low-resolution mode on a
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/// higher-resolution display
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/// </param>
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public DisplaySetting(
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DisplayPossibleSetting validSetting,
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Point position,
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DisplayOrientation orientation,
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DisplayFixedOutput outputScalingMode)
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: this(
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validSetting.Resolution, position, validSetting.ColorDepth, validSetting.Frequency,
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validSetting.IsInterlaced, orientation, outputScalingMode
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)
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{
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}
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/// <summary>
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/// Creates a new <see cref="DisplaySetting" /> instance.
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/// </summary>
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/// <param name="resolution">Display resolution</param>
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/// <param name="position">Display position on desktop</param>
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/// <param name="frequency">Display frequency</param>
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public DisplaySetting(Size resolution, Point position, int frequency)
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: this(resolution, position, ColorDepth.Depth32Bit, frequency)
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{
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}
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/// <summary>
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/// Creates a new <see cref="DisplaySetting" /> instance.
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/// </summary>
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/// <param name="resolution">Display resolution</param>
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/// <param name="frequency">Display frequency</param>
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public DisplaySetting(Size resolution, int frequency)
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: this(resolution, new Point(0, 0), ColorDepth.Depth32Bit, frequency)
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{
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}
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/// <summary>
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/// Creates a new <see cref="DisplaySetting" /> instance.
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/// </summary>
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/// <param name="resolution">Display resolution</param>
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/// <param name="position">Display position on desktop</param>
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/// <param name="frequency">Display frequency</param>
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/// <param name="colorDepth">Display color depth</param>
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/// <param name="isInterlaced">Indicating if display is using interlaces scan out</param>
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/// <param name="orientation">Display orientation and rotation</param>
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/// <param name="outputScalingMode">
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/// Display output behavior in case of presenting a low-resolution mode on a
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/// higher-resolution display
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/// </param>
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public DisplaySetting(
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Size resolution,
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Point position,
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ColorDepth colorDepth,
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int frequency,
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bool isInterlaced = false,
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DisplayOrientation orientation = DisplayOrientation.Identity,
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DisplayFixedOutput outputScalingMode = DisplayFixedOutput.Default
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) : base(resolution, frequency, colorDepth, isInterlaced)
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{
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Position = position;
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Orientation = orientation;
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OutputScalingMode = outputScalingMode;
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}
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internal DisplaySetting() : base(default)
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{
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IsEnable = false;
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}
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private DisplaySetting(DeviceMode deviceMode) : base(deviceMode)
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{
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Position = new Point(deviceMode.Position.X, deviceMode.Position.Y);
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Orientation = deviceMode.DisplayOrientation;
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OutputScalingMode = deviceMode.DisplayFixedOutput;
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if (Resolution.IsEmpty && Position.IsEmpty)
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{
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IsEnable = false;
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}
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}
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/// <summary>
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/// Gets a boolean value indicating if this instance is currently enable
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/// </summary>
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public bool IsEnable { get; } = true;
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/// <summary>
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/// Gets or sets the orientation of the display monitor
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/// </summary>
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public DisplayOrientation Orientation { get; }
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/// <summary>
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/// Gets output behavior in case of presenting a low-resolution mode on a higher-resolution display
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/// </summary>
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public DisplayFixedOutput OutputScalingMode { get; }
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/// <summary>
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/// Gets or sets the position of the display monitor
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/// </summary>
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public Point Position { get; }
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/// <summary>
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/// Applies settings that are saved using SaveDisplaySettings() or other similar methods but not yet applied
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/// </summary>
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public static void ApplySavedSettings()
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{
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var result = DeviceContextApi.ChangeDisplaySettingsEx(
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null,
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IntPtr.Zero,
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IntPtr.Zero,
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ChangeDisplaySettingsFlags.Reset,
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IntPtr.Zero
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);
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if (result != ChangeDisplaySettingsExResults.Successful)
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{
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throw new ModeChangeException($"[{result}]: Applying saved settings failed.", null, result);
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}
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}
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/// <summary>
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/// Returns the current display settings of a screen
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/// </summary>
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/// <param name="screenName">The name of the screen.</param>
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/// <returns>An instance of <see cref="DisplaySetting" /></returns>
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public static DisplaySetting GetCurrentFromScreenName(string screenName)
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{
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return new DisplaySetting(GetDeviceMode(screenName, DisplaySettingsMode.CurrentSettings));
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}
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/// <summary>
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/// Returns the saved display settings of a screen
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/// </summary>
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/// <param name="screenName">The name of the screen.</param>
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/// <returns>An instance of <see cref="DisplaySetting" /></returns>
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public static DisplaySetting GetSavedFromScreenName(string screenName)
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{
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return new DisplaySetting(GetDeviceMode(screenName, DisplaySettingsMode.RegistrySettings));
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}
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/// <summary>
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/// Sets and possibility applies a list of display settings
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/// </summary>
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/// <param name="newSettingPairs">
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/// A key value dictionary of <see cref="DisplayDevice" /> and <see cref="DisplaySetting" />
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/// instances.
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/// </param>
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/// <param name="applyNow">Indicating if the changes should be applied immediately, recommended value is false</param>
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public static void SaveDisplaySettings(
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Dictionary<DisplayScreen, DisplaySetting> newSettingPairs,
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bool applyNow)
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{
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SaveDisplaySettings(
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newSettingPairs.ToDictionary(pair => pair.Key.ScreenName, pair => pair.Value),
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applyNow,
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true
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);
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}
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/// <summary>
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/// Sets and possibility applies a list of display settings
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/// </summary>
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/// <param name="newSettingPairs">A key value dictionary of source ids and <see cref="DisplaySetting" /> instance</param>
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/// <param name="applyNow">Indicating if the changes should be applied immediately, recommended value is false</param>
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public static void SaveDisplaySettings(
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Dictionary<int, DisplaySetting> newSettingPairs,
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bool applyNow)
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{
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SaveDisplaySettings(
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newSettingPairs.ToDictionary(pair => $"\\\\.\\DISPLAY{pair.Key:D}", pair => pair.Value),
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applyNow,
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true
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);
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}
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private static DeviceMode GetDeviceMode(string screenName, DisplaySettingsMode flags)
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{
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var deviceMode = new DeviceMode(DeviceModeFields.None);
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return !string.IsNullOrWhiteSpace(screenName) &&
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DeviceContextApi.EnumDisplaySettings(
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screenName,
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flags,
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ref deviceMode
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)
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? deviceMode
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: default;
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}
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private static void SaveDisplaySettings(
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Dictionary<string, DisplaySetting> newSettings,
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bool applyNow,
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bool retry
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)
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{
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var screens = DisplayScreen.GetScreens()
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.Where(screen => screen.IsValid)
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.ToList();
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var rollbackSettings = screens
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.ToDictionary(screen => screen.ScreenName, screen => screen.CurrentSetting);
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try
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{
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foreach (var newSetting in newSettings)
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{
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screens.Remove(
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screens.FirstOrDefault(
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screen => screen.ScreenName.Equals(newSetting.Key)
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)
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);
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newSetting.Value.Save(newSetting.Key, false);
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}
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// Disable missing monitors
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foreach (var screen in screens.Where(screen => screen.IsValid))
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{
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screen.Disable(false);
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}
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if (applyNow)
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{
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ApplySavedSettings();
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}
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}
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catch (ModeChangeException)
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{
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if (retry)
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{
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SaveDisplaySettings(rollbackSettings, false, false);
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}
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throw;
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}
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}
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/// <inheritdoc />
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public override string ToString()
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{
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return IsEnable
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? $"{Resolution} {(IsInterlaced ? "Interlaced" : "Progressive")} {Frequency}hz @ {ColorDepth} @ {Position}"
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: "Disabled";
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}
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internal void Save(string screenName, bool reset)
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{
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var deviceMode = GetDeviceMode(screenName);
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var flags = ChangeDisplaySettingsFlags.UpdateRegistry | ChangeDisplaySettingsFlags.Global;
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flags |= reset ? ChangeDisplaySettingsFlags.Reset : ChangeDisplaySettingsFlags.NoReset;
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if (IsEnable && Position.X == 0 && Position.Y == 0)
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{
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flags |= ChangeDisplaySettingsFlags.SetPrimary;
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}
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var result = DeviceContextApi.ChangeDisplaySettingsEx(
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screenName,
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ref deviceMode,
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IntPtr.Zero,
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flags,
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IntPtr.Zero
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);
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if (result != ChangeDisplaySettingsExResults.Successful)
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{
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throw new ModeChangeException($"[{result}]: Applying saved settings failed.", null, result);
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}
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}
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private DeviceMode GetDeviceMode(string screenName)
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{
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DeviceMode deviceMode;
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if (IsEnable)
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{
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var flags = DisplayFlags.None;
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if (IsInterlaced)
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{
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flags |= DisplayFlags.Interlaced;
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}
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deviceMode = new DeviceMode(
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screenName,
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new PointL(Position),
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Orientation,
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OutputScalingMode,
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(uint) ColorDepth,
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(uint) Resolution.Width,
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(uint) Resolution.Height,
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flags,
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(uint) Frequency
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);
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}
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else
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{
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deviceMode = new DeviceMode(
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screenName,
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DeviceModeFields.PelsWidth | DeviceModeFields.PelsHeight | DeviceModeFields.Position
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);
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}
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if (string.IsNullOrWhiteSpace(deviceMode.DeviceName))
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{
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throw new MissingDisplayException("Display screen is missing or invalid.", null);
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}
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return deviceMode;
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}
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}
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}
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