mirror of
https://github.com/xcp-ng/xenadmin.git
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351 lines
15 KiB
C#
351 lines
15 KiB
C#
/* Copyright (c) Citrix Systems, Inc.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms,
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* with or without modification, are permitted provided
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* that the following conditions are met:
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*
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* * Redistributions of source code must retain the above
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* copyright notice, this list of conditions and the
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* following disclaimer.
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* * Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the
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* following disclaimer in the documentation and/or other
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* materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
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* CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
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* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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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.Drawing.Drawing2D;
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using System.Drawing.Imaging;
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using System.Text;
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using System.Windows.Forms;
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using XenAdmin.Core;
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namespace XenAdmin.Controls.Ballooning
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{
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public partial class ShinyBar : UserControl
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{
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private static readonly Font font = new Font("Segoe UI", 9);
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//private static readonly Font font = FormFontFixer.DefaultFont;
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private const int radius = 5;
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private const int pad = 2;
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private const int TEXT_PAD = 3;
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private const int TEXT_FADE = 8;
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// Because one bar has several regions with different tooltips, we handle the tooltip timing etc. ourselves.
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private ToolTip toolTip = new ToolTip();
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private Dictionary<Rectangle, string> toolTipRegions = new Dictionary<Rectangle, string>();
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private Timer toolTipTimer = new Timer();
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private const int TOOLTIP_DELAY = 500;
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private Point lastMouseLocation;
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private Point toolTipLocation;
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private string toolTipText;
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private bool ignoreNextOnMouseMove;
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public ShinyBar()
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{
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InitializeComponent();
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toolTip.Popup += toolTip_Popup;
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toolTipTimer.Interval = TOOLTIP_DELAY;
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toolTipTimer.Tick += toolTipTimer_Tick;
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}
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protected void DrawToTarget(Graphics g, Rectangle barBounds, Rectangle segmentBounds, Color color)
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{
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DrawToTarget(g, barBounds, segmentBounds, color, "", Color.Empty, HorizontalAlignment.Left, "");
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}
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protected void DrawToTarget(Graphics g, Rectangle barBounds, Rectangle segmentBounds, Color color, string text, Color textColor, HorizontalAlignment alignment, string toolTipText)
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{
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// The width shouldn't normally be < 0, but free space can be transiently < 0 while the metrics catch up,
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// especially across a reboot of a VM.
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if (segmentBounds.Width <= 0)
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return;
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// We draw the whole bar for each segment, but clip to the region corresponding to that segment (as if we
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// were viewing it through a succession of windows). This is the easiest way to make it the right shape.
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g.Clip = new Region(segmentBounds);
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g.SmoothingMode = SmoothingMode.AntiAlias;
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using (GraphicsPath outerPath = GetRoundedPath(barBounds, radius))
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{
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// Outer rounded rectangle
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{
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Color topColor = color;
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Color bottomColor = ControlPaint.LightLight(color);
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using (LinearGradientBrush outerBrush = new LinearGradientBrush(barBounds, topColor, bottomColor, LinearGradientMode.Vertical))
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{
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g.FillPath(outerBrush, outerPath);
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}
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}
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}
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// Render text
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// Text is rendered behind the 'reflection'. It is centered within the segment, unless the segment is too narrow to fit all the text,
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// in which case the text is rendered TEXT_PAD pixels from the left edge. If the text would extend into the TEXT_PAD pixels from
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// the right edge of the segment, then the right TEXT_FADE pixels of the text are faded out.
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if (!String.IsNullOrEmpty(text))
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{
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g.TextRenderingHint = System.Drawing.Text.TextRenderingHint.AntiAliasGridFit;
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StringFormat sf = new StringFormat();
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SizeF textSize = g.MeasureString(text, font);
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float horizPos;
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switch (alignment)
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{
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case HorizontalAlignment.Left:
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horizPos = segmentBounds.Left + TEXT_PAD;
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break;
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case HorizontalAlignment.Right:
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// NB If the caption is multi-line, it's still left-aligned within its box:
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// just the box is right-aligned within the segment.
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horizPos = segmentBounds.Right - textSize.Width - TEXT_PAD;
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break;
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default: // HorizontalAlignment.Center:
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horizPos = segmentBounds.Left + (segmentBounds.Width - textSize.Width) / 2;
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break;
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}
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RectangleF textRect = new RectangleF(horizPos,
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segmentBounds.Top + (segmentBounds.Height - textSize.Height * 0.9f) / 2,
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textSize.Width,
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textSize.Height);
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if (textRect.X < segmentBounds.X + TEXT_PAD)
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{
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textRect.Offset((segmentBounds.X + TEXT_PAD) - textRect.X, 0);
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}
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// Render text to a bitmap...
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using (Bitmap bitmap = new Bitmap((int)(segmentBounds.Width + 1), (int)(segmentBounds.Height + 1), PixelFormat.Format32bppArgb))
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{
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using (Graphics gBitmap = Graphics.FromImage(bitmap))
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{
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gBitmap.TextRenderingHint = System.Drawing.Text.TextRenderingHint.AntiAliasGridFit;
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gBitmap.Clip = new Region(new Rectangle(TEXT_PAD, 0, bitmap.Width - 2 * TEXT_PAD, bitmap.Height));
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textRect.X -= segmentBounds.Left;
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textRect.Y -= segmentBounds.Top;
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using (SolidBrush textBrush = new SolidBrush(textColor))
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gBitmap.DrawString(text, font, textBrush, textRect, sf);
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// ...if we can't fit all the text in, overlay fade...
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if (textSize.Width + (2 * TEXT_PAD) > bitmap.Width)
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{
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for (int x = bitmap.Width - TEXT_FADE - TEXT_PAD; x < bitmap.Width - TEXT_PAD; x++)
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{
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if (x < 0)
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{
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// For very narrow segments, don't try to paint outside segment
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continue;
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}
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double i = (x - bitmap.Width + TEXT_FADE + TEXT_PAD) / (double)TEXT_FADE;
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for (int y = 0; y < bitmap.Height; y++)
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{
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Color c = bitmap.GetPixel(x, y);
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int alpha = (int)(c.A - (i * c.A));
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c = Color.FromArgb(alpha, c.R, c.G, c.B);
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bitmap.SetPixel(x, y, c);
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}
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}
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}
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}
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// ...and render bitmap to final image
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Point location = new Point((int)segmentBounds.X, (int)segmentBounds.Y);
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g.DrawImage(bitmap, location);
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}
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}
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// Inner rounded rectangle
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RectangleF rect = new RectangleF(barBounds.X + pad, barBounds.Y + pad, barBounds.Width - (2f * pad), barBounds.Height * 0.49f);
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using (GraphicsPath innerPath = GetRoundedPath(rect, radius - pad))
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{
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int alphaTop = 120, alphaBottom = 30;
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Color topColor = Color.FromArgb(alphaTop, Color.White);
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Color bottomColor = Color.FromArgb(alphaBottom, Color.White);
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rect = new RectangleF(rect.X, rect.Y, rect.Width, rect.Height + pad + 1);
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using (LinearGradientBrush lighterBrush = new LinearGradientBrush(rect, topColor, bottomColor, LinearGradientMode.Vertical))
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{
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g.FillPath(lighterBrush, innerPath);
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}
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}
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// Remember the tooltip text
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if (!string.IsNullOrEmpty(toolTipText))
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toolTipRegions[segmentBounds] = toolTipText;
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// Reset the clip region
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g.Clip = new Region();
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}
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private static GraphicsPath GetRoundedPath(RectangleF rect, float radius)
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{
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float diameter = 2 * radius;
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GraphicsPath path = new GraphicsPath();
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path.StartFigure();
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path.AddArc(rect.X, rect.Y, diameter, diameter, 180, 90);
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path.AddArc(rect.Right - diameter, rect.Y, diameter, diameter, 270, 90);
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path.AddArc(rect.Right - diameter, rect.Bottom - diameter - 1, diameter, diameter, 0, 90);
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path.AddArc(rect.X, rect.Bottom - diameter - 1, diameter, diameter, 90, 90);
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path.CloseFigure();
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return path;
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}
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protected static void DrawGrid(Graphics g, Rectangle barArea, double bytesPerPixel, double max)
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{
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const int min_gap = 40; // min gap between consecutive labels (which are on alternate ticks)
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const int line_height = 12;
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int line_bottom = barArea.Top + barArea.Height / 2;
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int line_top = barArea.Top - line_height;
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int text_bottom = line_top - 2;
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// Find the size of the longest label
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string label = string.Format(Messages.VAL_MB, Util.ToMB(max, RoundingBehaviour.Nearest));
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Size labelSize = Drawing.MeasureText(g, label, Program.DefaultFont, TextFormatFlags.NoPadding);
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int longest = labelSize.Width;
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int text_top = text_bottom - labelSize.Height;
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// Calculate a suitable increment
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long incr = Util.BINARY_MEGA / 2;
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while((double)incr / bytesPerPixel * 2 < min_gap + longest)
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incr *= 2;
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// Draw the grid
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using (Pen pen = new Pen(BallooningColors.Grid))
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{
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bool withLabel = true;
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for (long x = 0; x <= max; x += incr)
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{
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// Tick
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int pos = barArea.Left + (int)((double)x / bytesPerPixel);
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g.DrawLine(pen, pos, line_top, pos, line_bottom);
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// Label
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if (withLabel)
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{
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label = Util.MemorySizeStringSuitableUnits(x, false);
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Size size = Drawing.MeasureText(g, label, Program.DefaultFont);
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Rectangle rect = new Rectangle(new Point(pos - size.Width/2, text_top), size);
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if (LabelShouldBeShown(max, label, x))
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{
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Drawing.DrawText(g, label, Program.DefaultFont, rect, BallooningColors.Grid, Color.Transparent);
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}
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}
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withLabel = !withLabel;
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}
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}
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}
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/// <summary>
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/// There are 2 cases:
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/// 1. If the maximum is smaller or equal to 1 GB, then show all the labels.
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/// 2. If the maximum is greater than 1 GB, then show only the labels that are a multiple of half a GB.
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/// </summary>
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/// <param name="max"></param>
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/// <param name="label"></param>
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/// <param name="x"></param>
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/// <returns></returns>
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private static bool LabelShouldBeShown(double max, string label, long x)
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{
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return max <= Util.BINARY_GIGA || (x % (0.5 * Util.BINARY_GIGA)) == 0;
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}
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protected virtual Rectangle barRect
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{
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get
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{
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return new Rectangle(20, 30, this.Width - 45, barHeight);
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}
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}
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protected virtual int barHeight
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{
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get { return 20; }
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}
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public override void Refresh()
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{
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toolTipRegions = new Dictionary<Rectangle, string>();
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base.Refresh();
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}
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protected override void OnMouseMove(MouseEventArgs e)
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{
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if (lastMouseLocation != e.Location)
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{
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// CA-38305: on some PCs OnMouseMove gets repeatedly called while the mouse cursor is still.
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// this if statement ensures that the code below is only called while the mouse is actually moving.
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if (ignoreNextOnMouseMove)
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{
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// The reason for this is that when the tooltip pops up, we get an
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// additional onMouseMove which would otherwise hide the tooltip again.
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ignoreNextOnMouseMove = false;
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return;
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}
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toolTipTimer.Stop();
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toolTip.Hide(this);
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lastMouseLocation = e.Location;
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toolTipTimer.Start();
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}
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}
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protected override void OnMouseLeave(EventArgs e)
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{
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toolTipTimer.Stop();
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toolTip.Hide(this);
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}
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private void toolTipTimer_Tick(object sender, EventArgs e)
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{
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foreach (KeyValuePair<Rectangle, string> pair in toolTipRegions)
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{
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if (pair.Key.Contains(lastMouseLocation))
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{
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ShowTooltip(pair.Value, lastMouseLocation);
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toolTipTimer.Stop();
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}
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}
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}
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private void ShowTooltip(string text, Point location)
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{
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toolTipText = text;
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toolTipLocation = location;
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toolTip.Show(text, this, location);
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}
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private void toolTip_Popup(object sender, PopupEventArgs e)
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{
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Point correctLocation = lastMouseLocation + new Size(1, -e.ToolTipSize.Height); // put it above-right of the mouse
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if (toolTipLocation != correctLocation)
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{
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ShowTooltip(toolTipText, correctLocation);
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return;
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}
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ignoreNextOnMouseMove = true;
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}
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}
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}
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