I have just started studying at an university and came up with an idea to manage my transcripts. It's basically a text editor with a small versioning system wrapped around it.
To avoid ending up with walls of black and white text I had the idea to add some presets for "graphics" (not sure what is the right word to use here). For example, if my professor writes down some kind of definition like this one:
Integral
Also called Riemann integral. the numerical measure of the area
bounded above by the graph of a given function, below by the x -axis, and on .........
I would like to wrap it into some kind of different background and styling, just like here on StackExchange on the quote above, with the press of a button. Another example is in one of my books:
Is it even possible to include such styling into a RichTextBox or should I look for alternatives / existing text editors?
Yeah, implementation Example is given to this URL Stack Overflow Answer
and some code for knowledge purpose
//Apply Some Font to selection
richTextBox1.SelectionFont = new Font("Arial", 16);
// Apply same color of text
richTextBox1.SelectionColor = Color.Purple;
//backgroud colour of Selection
richTextBox1.SelectionBackColor = Color.Red;
One more thing is to clearify, if you want to make a text editor, you have to given combo box for colour, size etc, and change this on IndexChange Event.
Related
I've created a custom button control. Basically one button-rectangle, but with two areas inside the rectangle that have a different behavior. For that reason I want to draw the hot and pressed state ONLY for the specific areas, not the hole button.
My current approach is drawing the basic-button using ButtonRenderer.DrawButton(...) with an emtpy text, draw the hot or pressed state if required and finally drawing the text. So far so good, but how do I get the (gradient) colors for the hot/pressed state?
I've tried SystemColors, KnownColors and VisualStyleRenderer.GetColor(ColorProperty.XYZ) but none of them seems to match? How can I read those colors from the host system?
EDIT:
Sample picture below:
I want the colors of both the hot and the pressed button-state - (light) blue in case of this win7 screenshot. If you zoom in you can see that a slight color gradient in both the upper and the lower half is used.
The last button shows what I want to accomplish.
Sure, I could extract the colors from the screenshots and hardcode them or use images like suggested, but that would work only for this specific system, wouldn't it?
Thanks for your answers, Jimi.
According to the accepted answer of your linked SO-question I checked ButtonBaseAdapter and ButtonStandardAdapter. As you also mentioned, ButtonRenderer.DrawButton calls VisualStyleRenderer.DrawBackground which calls the native API UxTheme.DrawThemedBackground to draw the button - the color determination happens inside.
This native API call also draws the button-border and thats the reason why I can't use it.
But I was able to solve my Problem, an unusual way, but it works.
I render both relevant states (hot and pressed) to a bitmap and extract the colors using .GetPixel. In OnPaint I create LinearGradientBrush-instances from the extracted colors and draw the hot/pressed effect over the specific areas of the normal button.
It's not the exact same behavior like a normal button (for both states the border color also changes), but I think it would look really strange if I change the border color only for a part of the button (where the hot/pressed effect is displayed) to match the normal button behavior...
If no other answers or solutions come up I'll mark this post in a few days as an answer...
I'm trying to use the RichTextBox (that I've modified a bit with some additions found here and there) so that when I print, my white text becomes black.
To be more precise, I have a RichTextBox with a PrintDocument, PrintPreviewDialog, and so on. I can print without problem with this setup. The only thing is that my application has a dark theme (it is made to be used mainly by night) and the RichTextBox has a black background and the default text is white.
Therefore, when I print (or preview), the white text stays white and it can't be seen when printed...
I would then like to know how I would need to modify my components to change the font color from white to black upon printing. I do not care about other colors (they are the assumed choice of the user) that will be printed fine anyway.
Thanks so much for your pointers on this!
Put this code in your print handler,
var selection = myRichTextBox.Selection;
if (!selection.IsEmpty)
richTextBox1.SelectionColor = Color.Black;
This question already has answers here:
Draw text on a .net Control with negative color of the background - blend
(2 answers)
Closed 8 years ago.
I have a menu whereby a user can select colours, I display them like this:
Because I write the colour codes in black, the dark blue background makes it difficult to read and the black is obviously completely hidden. Firstly, this isn't particularly important, the colour is what the user is interested in.
I could put the colour code in a separate box on a white background, but out of interest I wondered if there was some standard code to handle this or some easy method that could be applied to ensure that the text was always readable? If anyone could point me to a resource with any help it would be appreciated.
I would just choose white if the colour is dark and black if it is light. Many applications do that, but I don't think there is standard implementation in .net libraries.
Try something like:
Color ForegroundForBackground(Color bg) {
if(bg.R*2 + bg.G*7 + bg.B < 500)
return Color.White;
else
return Color.Black;
}
You want to use white on pure blue, but not on pure gren and pure red because those look brighter. Tune the number to what looks sensible.
Edit: Since j.k. kindly provided the link to Luminance (colorimetry), I've changes the linear combination to match better (rounded the numbers to 1 digit, don't really need more). Though I suspect the coefficient for green might prove too large in testing.
Yes, it should be possible to adjust the color dynamically.
There are two parts to your question. The first is changing the color and the second is determining what to change the color to.
The first is the more complex of the two. I see two primary options:
Create your own control by inheriting from the existing control and override the appropriate functions to check the background in order to return a contrasting foreground color.
Create a value converter and bind your foreground colors to the return from the converter.
Of those two options, the value converter gives you the greatest portability across controls. But it may or may not work with the UI technology that you're using.
The second step, determining what color to use, is a little bit more straightforward. This and this are two SO questions that deal with reversing or inverting the color. There are some edge cases based upon saturation that may not work the way you expect. Alternatively, if your background colors are limited you can simply use a lookup table and be certain the results are what you expect.
Is there a way to color parts of ListBox Items (not only whole line)?
For example listbox item consists of 5 words and only one is colored or 3 of 5.
Is there a way to do the same with ListView? (I know that ListView can be colored per column but i would like to have multiple colors in one column).
I am interested in only free solutions, and preferred that they are not heavy to implement or change current usage (the least effort to introduce colored ListBox in place of normal one the better).
With regards,
MadBoy
This article tells how to use DrawItem of a ListBox with DrawMode set to one of the OwnerDraw values. Basically, you do something like this:
listBox1.DrawMode = OwnerDrawFixed;
listBox1.DrawItem += new System.Windows.Forms.DrawItemEventHandler(this.listBox1_DrawItem);
private void listBox1_DrawItem(object sender, DrawItemEventArgs e)
{
e.DrawBackground();
e.DrawFocusRectangle();
// TODO: Split listBox1.Items[e.Index].ToString() and then draw each separately in a different color
e.Graphics.DrawString(listBox1.Items[e.Index].ToString(),new Font(FontFamily.GenericSansSerif, 14, FontStyle.Bold),new SolidBrush(color[e.Index]),e.Bounds);
}
Instead of the single DrawString call, Split listBox1.Items[e.Index].ToString() into words and make a separate call to DrawString for each word. You'll have to replace e.bounds with an x,y location or a bounding rectangle for each word.
The same approach should work for ListView.
There is no built-in API which supports this type of modification to a WinForms ListBox or ListView. It is certainly possible to achieve this but the solution will involve a lot of custom painting and likely overriding WndProc. This will be a very involved and heavy solution.
If this type of experience is important to your application I think you should very seriously consider WPF as a solution. WPF is designed to provide this type of eye candy and there are likely many samples on the web to get you up and running.
For our winforms application, we've been asked to colour invalid cells in a DataGridView in a red colour. We need to find a red colour that matches the current visual style but which is still distinctive if the user has chosen a palette with mostly reds. How do I create a colour that will match the current visual style? How do I make sure I avoid clashes?
I don't think the original poster is looking to make a palette of colors (colours), instead he is trying to highlight an invalid cell. The chosen highlight color is red, but he is concerned that red might not stick out if the user has chosen a red palette.
How about this: When painting an invalid cell, use SystemColors.Window for the text and SystemColors.WindowText for the background. (or whatever equivalents there are for a DataGridView). This way, you are guaranteed that the invalid cell will be the opposite colors of a normal cell.
I think that you are looking at this the wrong way. Red is often chosen for several reasons. It is (in western culture among others) commonly used to depict that something is wrong or danger. But red is also a colour that usually stands out. However, when trying to direct a users attention to something on the page, there are two infallible methods.
1) Animated gifs or videos (annoying as f***) or
2) Clashing colours
Usually red stands out, but in your situation where a user may have a red themed style, your best bet is to go with a colour that will clash. It is possible to have clashing colours that go together (if that makes sense).
Here are a few websites that I have used in the past to help me find colour schemes that may help you as well:
Kuler, Color Combos and Color scheme designer
This may not have been the answer you were looking for but i hope it helps
The question is a bit ambiguous and a little subjective; it much easier to comment directly on examples. However, there are a multitude of on-line tools that will help you create colour palettes for websites, and these may be useful to gauge how a particular shade of red interacts with various other colours.
Hope this helps.
You could maybe try to use the Light and Dark methods of the ControlPaint class? I do something similar, although kind of in the opposite direction. I needed to make some rows in a grid stand out, but not stand out as much as the selected rows. So I created a color that was a bit lighter than the default selection color like this:
checkedColor = ControlPaint.Light(grid.DefaultCellStyle.SelectionBackColor, 1.65f);
Could try to use that, maybe with some added logic, and base it on some system color that is made to stand out. For example System.Drawing.SystemColors.HighLight or System.Drawing.SystemColors.HotTrack.
take a look at the Krypton Toolkit (http://www.componentfactory.com). They offer a free toolkit for WinForms controls with a theme manager. This theme manager provides ready to use methods to extract the current color values.
I have nothing to do with them. I use it for my own Product (Royal TS at http://www.code4ward.net) and found it really useful.
If you want to build beautiful UI, you should take a look at the Krypton stuff.