using System;using System.Drawing;using System.Drawing.Drawing2D;using System.Collections;using System.ComponentModel;using System.Windows.Forms;using System.Data;namespace CBalloon{/// <summary>/// Summary description for CBalloonBase./// </summary>public class CBalloonBase : System.Windows.Forms.Form{#region enumeration describing the orientation of the bubble tippublic enum sdSide {sd_top,sd_left,sd_bottom,sd_right,sd_horizontal,sd_vertical}public enum alAlign{al_lhs,al_mid,al_rhs}#endregionconst int C_QUOTEH = 25;const int C_ARCH = 5;const int C_SHADOW = 5;protected GraphicsPath m_path;protected Region m_rOuterFrame;protected Region m_rInnerFrame;protected bool m_bShowFrame = true;protected bool m_bIsShadow = false;protected bool m_bHasShadow = false;// properties that allow a color gradient from top left to top right of the balloon's frameprotected Color m_cTopLeft = Color.Aqua;protected Color m_cBotRite = Color.Lime;// location of the balloon's tail tip (left, right, top, bottom etc)private alAlign m_tipAlign = alAlign.al_lhs;private sdSide m_tipSide = sdSide.sd_top;// absolute position of the balloon's tail tippublic Point m_ptTipPosition = new Point(0, 0);// rectangle and center point used to calculate the color gradient for the framepublic RectangleF m_rtBalloonF = new RectangleF(0.0F, 0.0F, 1.0F, 1.0F);private Point m_ptCenter = new Point(0, 0);// tail offset from the nearest rounded edge (auto calculated when anchored to a point or control)protected int m_nTailOffset = 30;// marks the position, width and height of the anchor point or control// if a point is used, the width and height are set to zeroprotected Rectangle m_rtAnchor = new Rectangle(0, 0, 0, 0);// the parent form which contains the anchor pointprivate Form m_fmParent = null;// a shadow form constructed from this class, shaded gray with opacity below 100% to simulate a shadowprivate CBalloon.CBalloonBase m_fmShadow = null;// event handler which is attached to the form containing the anchor point. when// the form moves, the balloon will move with itpublic System.EventHandler m_evhMove;// stuff the compiler addsprivate System.ComponentModel.Container components = null;private System.Windows.Forms.Label label1;public CBalloonBase(){//// Required for Windows Form Designer support//InitializeComponent();//// TODO: Add any constructor code after InitializeComponent call//}/// <summary>/// Clean up any resources being used./// </summary>protected override void Dispose( bool disposing ){if( disposing ){if (components != null) {components.Dispose();}}base.Dispose( disposing );}#region Windows Form Designer generated code/// <summary>/// Required method for Designer support - do not modify/// the contents of this method with the code editor./// </summary>private void InitializeComponent(){this.label1 = new System.Windows.Forms.Label();this.SuspendLayout();// // label1// this.label1.BorderStyle = System.Windows.Forms.BorderStyle.FixedSingle;this.label1.Location = new System.Drawing.Point(32, 32);this.label1.Name = "label1";this.label1.Size = new System.Drawing.Size(58, 15);this.label1.TabIndex = 0;this.label1.Text = "press me";this.label1.Click = new System.EventHandler(this.label1_Click);// // CBalloonBase// this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);this.BackColor = System.Drawing.Color.FromArgb(((System.Byte)(255)), ((System.Byte)(255)), ((System.Byte)(192)));this.ClientSize = new System.Drawing.Size(295, 214);this.Controls.AddRange(new System.Windows.Forms.Control[] { this.label1});this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.None;this.MaximizeBox = false;this.MinimizeBox = false;this.Name = "CBalloonBase";this.ShowInTaskbar = false;this.SizeGripStyle = System.Windows.Forms.SizeGripStyle.Hide;this.StartPosition = System.Windows.Forms.FormStartPosition.Manual;this.Resize = new System.EventHandler(this.CBalloonBase_Resize);this.Click = new System.EventHandler(this.CBalloonBase_Click);this.Closing = new System.ComponentModel.CancelEventHandler(this.CBalloonBase_Closing);this.Move = new System.EventHandler(this.CBalloonBase_Move);this.VisibleChanged = new System.EventHandler(this.CBalloonBase_VisibleChanged);this.Paint = new System.Windows.Forms.PaintEventHandler(this.CBalloonBase_Paint);this.ResumeLayout(false);}#endregion// regenerate the path for the balloon, and set the region for the window public void reSizeMe() {m_path = new GraphicsPath();// nW and nH are just shorthand for the width and height of the formint nW = this.Width;int nH = this.Height;int nOuter = C_QUOTEH;int nInner = C_QUOTEH C_ARCH;// define the points for the balloon tail pA, pB and pC denote the outer frame for the tail while pAi,// pBi and pCi denote the inner border (used to create the inside boundary of a frame for our balloon)Point pA = new Point();Point pAi = new Point();Point pB = new Point();Point pBi = new Point();Point pC = new Point();Point pCi = new Point();#region this section calculates the position of the ballon tailswitch (m_tipSide) {// calculate vertical displacement for all top tailscase sdSide.sd_top: pA.Y = nOuter; pB.Y = 0; pC.Y = nOuter; pAi.Y = pA.Y 4; pBi.Y = pB.Y 4; pCi.Y = pC.Y 4; goto case sdSide.sd_horizontal;case sdSide.sd_left:pA.X = nOuter; pC.X = nOuter; pB.X = 0; pAi.X = pA.X 4; pCi.X = pC.X 4; pBi.X = pB.X 4;goto case sdSide.sd_vertical;case sdSide.sd_right:pA.X = nW - nOuter; pC.X = nW - nOuter; pB.X = nW; pAi.X = pA.X - 4; pCi.X = pC.X - 4; pBi.X = pB.X - 4;goto case sdSide.sd_vertical;case sdSide.sd_bottom:pA.Y = nH - nOuter; pC.Y = nH - nOuter; pB.Y = nH; pAi.Y = pA.Y - 4; pCi.Y = pC.Y - 4; pBi.Y = pB.Y - 4;goto case sdSide.sd_horizontal;case sdSide.sd_horizontal:if (m_tipAlign == alAlign.al_lhs) {pA.X = nInner m_nTailOffset; pB.X = pA.X - 10; pC.X = pA.X 30;pAi.X = pA.X 4; pBi.X = pB.X 3; pCi.X = pC.X 2; } else if (m_tipAlign == alAlign.al_mid) {pB.X = (int)(nW / 2);pA.X = pB.X - 10;pC.X = pB.X 10;pAi.X = pA.X;pBi.X = pB.X;pCi.X = pC.X;} else {pC.X = (nW - nInner) - m_nTailOffset; pA.X = pC.X - 30; pB.X = pC.X 10;pAi.X = pA.X - 2; pBi.X = pB.X - 3; pCi.X = pC.X - 4; }break;case sdSide.sd_vertical:if (m_tipAlign == alAlign.al_lhs) {pA.Y = nInner m_nTailOffset; pC.Y = pA.Y 30;pB.Y = pA.Y - 10; pAi.Y = pA.Y 4; pBi.Y = pB.Y 3; pCi.Y = pC.Y 2; }else if (m_tipAlign == alAlign.al_mid) {pB.Y = (int)(nH / 2);pA.Y = pB.Y - 10;pC.Y = pB.Y 10;pAi.Y = pA.Y;pBi.Y = pB.Y;pCi.Y = pC.Y;} else {pC.Y = (nH - nInner) - m_nTailOffset; pA.Y = pC.Y - 30; pB.Y = pC.Y 10;pAi.Y = pA.Y - 2; pBi.Y = pB.Y - 3; pCi.Y = pC.Y - 4; }break;}#endregion// the new tip position is determined by pBm_ptTipPosition = pB;// generate balloon tail outer pathm_path.AddLines(new Point[] { pA, pB, pC } );m_path.CloseFigure();// generate balloon tail inner pathGraphicsPath iPath = new GraphicsPath();iPath.AddLines(new Point[] {pAi, pBi, pCi} );iPath.CloseFigure();#region generate the outer frame (m_rOuterFrame) which becomes the shape of the balloon formSize pSize = new Size(nW - (nInner nInner), nH - (nOuter nOuter));Point pLoc = new Point(nInner, nOuter);Rectangle aRect = new Rectangle(pLoc, pSize);m_rOuterFrame = new Region(aRect);// generate 2nd pass region for the outer frame, starting to form the rounded edgespSize.Width = 4;pSize.Height -= 2;pLoc.X -= 2;pLoc.Y = 1;m_rOuterFrame.Union(new Rectangle(pLoc, pSize));// generate 3rd pass for the outer frame, developing rounded edgespSize.Width = 2;pSize.Height -= 2;pLoc.X -= 1;pLoc.Y = 1;m_rOuterFrame.Union(new Rectangle(pLoc, pSize));// generate 4th pass for the outer frame, developing rounded edgespSize.Width = 2;pSize.Height -= 2;pLoc.X -= 1;pLoc.Y = 1;m_rOuterFrame.Union(new Rectangle(pLoc, pSize));// generate 5th pass for the outer frame, completing the rounded edgespSize.Width = 2;pSize.Height -= 4;pLoc.X -= 1;pLoc.Y = 2;m_rOuterFrame.Union(new Rectangle(pLoc, pSize));// generate 6th pass for the outer frame, adding the balloon tailm_rOuterFrame.Union(m_path);#endregion#region for shadow windows we don't need to paint the area under the foreground balloonif (m_bIsShadow == true) {Region rgnEx;rgnEx = m_rOuterFrame.Clone();rgnEx.Translate(-C_SHADOW, -C_SHADOW);m_rOuterFrame.Exclude(rgnEx);}#endregion// set the region for the formthis.Region = m_rOuterFrame;Graphics eg = Graphics.FromHwnd(this.Handle);// calculate the bounding rectangle for this region (within the context of the form itself) and the centre point for// the rectanglem_rtBalloonF = this.Region.GetBounds(eg);m_ptCenter = new Point((int)((m_rtBalloonF.Width / 2) m_rtBalloonF.X), (int)((m_rtBalloonF.Height / 2) m_rtBalloonF.Y));eg.Dispose();#region always generate the outline region (m_rInnerFrame), even if we are not going to display it immediatelyRectangle myRect = new Rectangle(C_QUOTEH 6, C_QUOTEH 4, nW - ((2 * C_QUOTEH) 12), nH - ((2 * C_QUOTEH) 8));Region aRegion = new Region(myRect);// develop client region with rounded edges, 2nd and 3rd passmyRect.X -= 1; myRect.Y = 1; myRect.Width = 2; myRect.Height -= 2;aRegion.Union(myRect); myRect.X -= 1; myRect.Y = 1; myRect.Width = 2; myRect.Height -= 2;aRegion.Union(myRect); // clone the outer regionm_rInnerFrame = m_rOuterFrame.Clone();// exclude the client area and inner balloon tail edgem_rInnerFrame.Exclude(aRegion);m_rInnerFrame.Exclude(iPath);#endregion// force a complete redrawthis.Invalidate();}// There are many possible variations on this routine. However this works by calculating the distance to the side// of the screen, then adjusting the position, and direction, of the tail to avoid going off the edge of the screenprivate bool bCalcTailPos(Point ptA, bool bOnlyBelow) {int nBWidth = this.Width C_SHADOW - C_QUOTEH;int nBHeight = this.Height C_SHADOW; // get the pixel dimensions of the screen assuming a single monitor (or two monitors creating a single screen space)Screen [] screens = Screen.AllScreens;int nSWd = screens[0].Bounds.Width;int nSHt = screens[0].Bounds.Height;// if use below is false then we always draw the balloon above the anchorif (bOnlyBelow == false){ this.tailSide = sdSide.sd_bottom;} else {// if we cannot go below, then return false so the calling routine can set a new anchor point// positioned above the control (so the balloon tail is not drawn across the anchor)if (ptA.Y nBHeight >= nSHt) { return false; }this.tailSide = sdSide.sd_top;}// look for best horizontal fitint nDistToEdge = nSWd - ptA.X;// a) the left-most position of the tail tip is C_QUOTEH from the LHS (corresponding to a tail offset of 5)// b) the tail must be adjust so the remaining balloon plus the shadow and overhang must fit on the screenint nMinLength = (this.Width C_SHADOW) - C_QUOTEH;if (nDistToEdge > nMinLength) {// okay entire balloon fits, so use the minimum tail offsetthis.tailOffset = 5;this.tailAlign = alAlign.al_lhs;} else {int nOverlap = nMinLength - nDistToEdge;if (nOverlap < (int)Math.Round(nMinLength / 3.0)) {this.tailOffset = nOverlap 5;this.tailAlign = alAlign.al_lhs;} else if (nOverlap > (int)Math.Round((nMinLength - (C_QUOTEH C_ARCH)) / 2.0)) {// tail offset is now measure from the rhsint nTempOffset = (nMinLength - nOverlap) - (C_QUOTEH C_ARCH);if (nTempOffset < 0) { nTempOffset = 0; }this.tailOffset = nTempOffset 5;this.tailAlign = alAlign.al_rhs;} else {// tail offset not currently used for mid-point set... probably at some point I will needthis.tailOffset = 0;this.tailAlign = alAlign.al_mid;}}// now adjust the positionPoint atPoint = new Point(0, 0);atPoint.X = ptA.X - m_ptTipPosition.X;atPoint.Y = ptA.Y - m_ptTipPosition.Y;// locate our balloonthis.Location = atPoint;return true;}public void setBalloonPosition(Form onForm, Control onControl) {// determine ownership so the balloon stays ontop of the owning formif (m_fmShadow == null) {this.Owner = onForm;} else{m_fmShadow.Owner = onForm;}// remember the control's position and dimensionsm_rtAnchor = new Rectangle(onControl.Location, onControl.Size);Point ptA = m_rtAnchor.Location;Point ptC = ptA;// first, try for lower edge of the control as an anchor pointptA.Y = m_rtAnchor.Height;// calculate absolute position on the screenPoint ptScreen = onForm.PointToScreen(ptA);// see if we can anchor below the control if (bCalcTailPos(ptScreen, true) == false) { // unable to anchor below, so anchor aboveptScreen = onForm.PointToScreen(ptC);bCalcTailPos(ptScreen, false); }m_fmParent = onForm;// attach a callback so we know when the owner is moved. Oh the joys and advantages of delegates!m_evhMove = new System.EventHandler(this.Parent_Move);onForm.Move = m_evhMove;}// attach the balloon to a point on a form. for the balloon to auto-track any movement in the owning form,// we need to attach an event handler to the Move event on the owning form. Setting ownership ensure the // balloon is always shown on top of the owning form. In addition, a minimize action on the owning form will// force the balloon to minimize with it.public void setBalloonPosition(Form onForm, Point atPoint) {// to understand ownership, a balloon with a shadow has the shadow as the owner to ensure the balloon// is drawn directly on top of the shadow. Consequently when setting ownership to an attached point, // it is the shadow that gets attached to the owning form. But if no shadow exists, it is the Balloon // itself that must be attachedif (m_fmShadow == null) {this.Owner = onForm;} else{m_fmShadow.Owner = onForm;}// calculate absolute position of the pointm_rtAnchor = new Rectangle(atPoint, new Size(0, 0));Point ptScreen = onForm.PointToScreen(m_rtAnchor.Location);// see if we can anchor below the control if (bCalcTailPos(ptScreen, true) == false) { // unable to anchor below, so anchor aboveptScreen = onForm.PointToScreen(ptScreen);bCalcTailPos(ptScreen, false); }m_fmParent = onForm;// attach a callback so we know when the owner is moved. Oh the joys and advantages of delegates!m_evhMove = new System.EventHandler(this.Parent_Move);onForm.Move = m_evhMove;}public void Parent_Move(object sender, System.EventArgs e){if ((sender is Form) == false) { return; }// calculate absolute position on the screen and try for the lower edge firstPoint ptHigh = m_rtAnchor.Location;Point ptLow = ptHigh;ptLow.Y = m_rtAnchor.Height;Point ptScreen = ((Form)sender).PointToScreen(ptLow);// see if we can anchor below the control if (bCalcTailPos(ptScreen, true) == false) { // unable to anchor below, so anchor aboveptScreen = ((Form)sender).PointToScreen(ptHigh);bCalcTailPos(ptScreen, false); }}// if a shadow window does not yet exist, create itprivate bool bMakeShadow() {// a shadow cannot have another shadowif (this.m_bIsShadow) { return false; }// only generate a shadow if requiredif (m_bHasShadow != true) { return false; }// no shadows in design modeif (DesignMode == true) { return false; }// create shadow if non existsif (m_fmShadow == null) {m_fmShadow = new CBalloon.CBalloonBase();this.Owner = m_fmShadow;m_fmShadow.Width = this.Width;m_fmShadow.Height = this.Height;m_fmShadow.StartPosition = FormStartPosition.Manual;m_fmShadow.Location = new Point(this.Location.X C_SHADOW, this.Location.Y C_SHADOW);m_fmShadow.IsShadow = true;m_fmShadow.Opacity = 0.6;}return true;}private void DestroyShadow() {if (m_fmShadow != null) {// if the shadow has an owner, we need to attach the balloon to the owner and// sever existing owned form relationshipsif (m_fmShadow.Owner != null) {this.Owner = m_fmShadow.Owner;m_fmShadow.RemoveOwnedForm(this);this.Owner.RemoveOwnedForm(m_fmShadow);}m_fmShadow.Close();m_fmShadow.Dispose();m_fmShadow = null;}}// the shape of the form is maintained by reSizeMe() so the only function or reDrawMe() is to // paint the frame itselfpublic void reDrawMe( ) {// shadow boxes don't have a frameif (m_bShowFrame) {// for no particular reason, I'm using a gradient brush from top-left to bottom-right... // to grab the User's attention a pulsing frame (variable luminence) works much betterGraphics eg = Graphics.FromHwnd(this.Handle);// the bounding rectangle was calculated in reSizeMe()eg.RenderingOrigin = m_ptCenter;eg.FillRegion(new LinearGradientBrush(m_rtBalloonF, m_cTopLeft, m_cBotRite, 45, true), m_rInnerFrame);eg.Dispose();}}/// <summary>/// The main entry point for the application./// </summary>[STAThread]static void Main() {Application.Run(new CBalloonBase());}private void CBalloonBase_Paint(object sender, System.Windows.Forms.PaintEventArgs e){reDrawMe();}private void CBalloonBase_Click(object sender, System.EventArgs e){if (false == this.m_bIsShadow) { this.Close();}}private void CBalloonBase_Resize(object sender, System.EventArgs e){reSizeMe();}private void label1_Click(object sender, System.EventArgs e){// do not allow a shadow box to open another box...if (this.m_bIsShadow == false) {if (this is CExample) { this.Close(); } else {CBalloon.Form3 aForm = new Form3();aForm.Show();}}}private void CBalloonBase_VisibleChanged(object sender, System.EventArgs e){if (!m_bHasShadow) { return; }if (( this.Visible == true ) && (m_fmShadow != null)) {m_fmShadow.Show();} }private void CBalloonBase_Closing(object sender, System.ComponentModel.CancelEventArgs e){#region remove any form-owner relationships and events, and close the shadow form if it exists// clean up owner-form relationships from the Balloon formif (this.Owner != null) {this.Owner.RemoveOwnedForm(this);this.Owner = null;}// clean up owner-form relationships from the Shadow form, then close the Shadowif (m_fmShadow != null) { if (m_fmShadow.Owner != null) {m_fmShadow.Owner.RemoveOwnedForm(m_fmShadow);m_fmShadow.Owner = null;}m_fmShadow.Close(); }// here we need to remove the event handler from the form with the anchor pointif (m_fmParent != null) {m_fmParent.Move -= m_evhMove;m_fmParent = null;}#endregion}private void CBalloonBase_Move(object sender, System.EventArgs e){if (m_fmShadow != null) { m_fmShadow.Location = new Point(this.Location.X C_SHADOW, this.Location.Y C_SHADOW); }}#region form propertiespublic bool IsShadow {set {if (value == true) {if (m_bIsShadow == false) {this.ShowFrame = false;this.BackColor = Color.DarkGray;}}m_bIsShadow = value;}get{return m_bIsShadow;}}public bool HasShadow {set { m_bHasShadow = value; if (m_bHasShadow) {bMakeShadow();} else {DestroyShadow();}}get { return m_bHasShadow; }}public bool ShowFrame {set {if (m_bShowFrame != value) {m_bShowFrame = value;this.reDrawMe();}}get {return m_bShowFrame;}}public sdSide tailSide {set { m_tipSide = value; reSizeMe();if ((m_bHasShadow) && (this.m_fmShadow != null)) {m_fmShadow.tailSide = value;}}get { return m_tipSide; }}public int tailOffset {set { m_nTailOffset = value; reSizeMe();if (this.m_fmShadow != null) {m_fmShadow.tailOffset = value;}}get { return m_nTailOffset; }}public alAlign tailAlign {set { m_tipAlign = value; // better method is to generate a resize event but its 3am and I'm tiredreSizeMe();if (this.m_fmShadow != null) {m_fmShadow.tailAlign = value;}}get { return m_tipAlign; }}// set the color gradient from the top-left of the framepublic Color FrameTopLeft {set {m_cTopLeft = value;// better method is to generate a paint event but its 3am and I'm tiredthis.reDrawMe();}get {return m_cTopLeft;}}// set the color gradient running to the bottom-left of the framepublic Color FrameBottomRight {set {m_cBotRite = value;// better method is to generate a paint event but its 3am and I'm tiredthis.reDrawMe();}get {return m_cBotRite;}}#endregion}}
评论