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Embarcadero C++ Builder. How to build a Borland equivalent Smooth progress bar. This code is basically the translation of the description given for a SmoothProgress Bar at the Microsoft Support site http://support.microsoft.com/kb/816195. The SmoothProgressBar replaces the standard windows default progress indicator for custom GUI's and answers several drawbacks to not only the default progressbar, but many other Windows-default components such as lack of customization, even in development environments such as Microsoft's own Visual Studio. I will only post the the key methods Set_Value and OnPaint as they are the critical sections anyway and provide all the examples needed to code the other simpler sections described in the Microsoft article above. I should note this code, though it will be compilable working C++, will nonetheless still be a bit pseudo codish. This is because I had to do some tweaks and fudges here and there to get some more finesse behavior. Part of this is due to the fact that I derived this progress bar directly from TProgressBar. I had to 'hide' some of its base properties and replace them with my own equivalent. I also had to play around a bit with the drawing of some boundary lines to get this to fit into the default TProgressBar border properly. You could most certainly do this deriving directly from the more generic TComponent as well (similar to the article above). Set_Value(...): Code: [COLOR=Gray] /// <summary> /// [COLOR=Green]Set_Value[/Color] /// </summary> /// <param name="NewValue">[COLOR=Green]The new value of the progressbar.[/COLOR]</param> [/Color] void __fastcall SmoothProgressBar::Set_Value(int NewValue) { int oldValue = value; [COLOR=green]// Make sure that the value does not stray outside the valid range.[/COLOR] if (NewValue < minimum) { value = minimum; } else if (NewValue > maximum - 1) { value = maximum - 1; shrinkVertical = 3; lastLineFlag = true; } else { value = NewValue; } [COLOR=green]// Invalidate only the changed area.[/COLOR] float percent; TRect newValueRect(this->ClientRect); TRect oldValueRect(this->ClientRect); newValueRect.Left = newValueRect.Left; [COLOR=green]// Use a new value to calculate the rectangle for progress.[/COLOR] percent = (float)(value - minimum) / (float)(maximum - minimum); newValueRect.Right = newValueRect.Left + (int)((float)newValueRect.Width() * percent); newValueRect.Top = newValueRect.Top + shrinkVertical; newValueRect.Bottom = newValueRect.Bottom - shrinkVertical; oldValueRect.Left = oldValueRect.Left; [COLOR=green]// Use an old value to calculate the rectangle for progress.[/COLOR] percent = (float)(oldValue - minimum) / (float)(maximum - minimum); oldValueRect.Right = oldValueRect.Left + 2 + (int)((float)oldValueRect.Width() * percent); oldValueRect.Top = oldValueRect.Top + shrinkVertical; oldValueRect.Bottom = oldValueRect.Bottom - shrinkVertical; TRect updateRect; [COLOR=green]// Find only the part of the screen that must be updated.[/COLOR] if (newValueRect.Width() > oldValueRect.Width()) { updateRect.Left = oldValueRect.Width(); updateRect.IntersectRect(newValueRect, oldValueRect); } else { updateRect.Left = newValueRect.Width(); updateRect.IntersectRect(oldValueRect, newValueRect); } InvalidateRect(this->Handle, &updateRect, 1); SmoothProgressBar::OnPaint(this); } This, on the face of things, looks like (and pretty much is) a line for line translation. Borland clearly has some of its own little ways of doing things, but the equivalents are obvious (though not so easy to find! Hence my post here for others that may be looking). One thing that may jump out is the explicit call to OnPaint. TProgressBar does not seem to inherit this handler from its parent. I probably could have created a custom event without much additional complexity, but this was already simple, so I figured a direct call wouldn't hurt. OnPaint(...): Code: [COLOR=Gray] /// <summary> /// [COLOR=green]On Paint[/COLOR] /// </summary> /// <param name="Sender">[COLOR=green]The sender of this event[/COLOR]</param>[/COLOR] void __fastcall SmoothProgressBar::OnPaint(TObject *Sender) { HDC dc; HPEN dcPen; dc = GetDC(this->Handle); this->Brush->Color = this->progressBar_Color; float percent = (float)(value - minimum) / (float)(maximum - minimum); TRect clientRect(this->ClientRect); FillRect(dc, &clientRect, this->Brush->Handle); dcPen = CreatePen(PS_SOLID, 1, this->progressBar_Color); SelectObject(dc, dcPen); SetBkColor(dc, this->progressBar_Color); if (lastLineFlag == true) [COLOR=green]// Global flag[/COLOR] { MoveToEx(dc, clientRect.Right - 1, clientRect.Top + 1, NULL); LineTo(dc, clientRect.Right - 1, clientRect.Bottom - 1); MoveToEx(dc, clientRect.Right, clientRect.Top + 1, NULL); LineTo(dc, clientRect.Right, clientRect.Bottom - 1); } lastLineFlag = false; } Embarcadero clearly relies heavily on the Windows API here for basic graphical functions. What stands out that is different from the Microsoft example is that I don't draw a border. Since I inherited directly from TProgressBar, I got that border for free. However, I did have to do some fudging to get my colored rectangles to fit (not shown) and in particular to not overwrite the base class progress bar boundary at the end (the line logic in the code above). I hope this saves somebody some time in trudging through Google search results, questionably useful help files, and quite a bit of raw source code looking for similar examples to what I was trying to accomplish. Just one more little blip. Since I derived this from TProgressBar (which is really just a shell around the Windows Progress bar), I did have to hide and lock-in the defaults of some of the base properties. I will give an example of hiding the Position property: Code: [B][Color=DarkBlue]public: __property int[/B][/Color] Position = {read = position, default = 0}; [Color=green]// Hide the base[/Color] This is pretty straightforward... and the only direct example you will find on the net. Notice that to override the property, you must override it in the equivalent access section (public or published). Also, I left out the 'write' section, rendering the property read-only.
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Keywords: WPF, XAML, Static properties, dependency properties. It would seem that a class that is derived from System.Windows.DependencyObject cannot have static properties (???). It will compile, but any call to the constructor or to that particular property throws up an exception.
