I'm loading multiple images into a Panel (multiple PictureBoxes inside a Panel) and would like to resize the images as the windows form is resized.
Here is my code:
foreach (string filename in ofdmulti.FileNames){
picbox[i] = new PictureBox();
picbox[i].Size = new System.Drawing.Size(256, 256);
picbox[i].SizeMode = PictureBoxSizeMode.Zoom;
picbox[i].Dock = DockStyle.Fill;
i++;
}
But then I don't see the multiple images, just one and stretched fully, what may be wrong?
You have multiple issues with your code. First off, this line of code will ensure that you only see one PictureBox...likely the last one you added:
picbox[i].Dock = DockStyle.Fill;
Second, I don't see that you are setting the PictureBox Location, so they are all going to Point(0, 0), meaning they would overlap to some extent even regardless of the Dock setting.
If you are trying to get a nice arrangement, such as Tiled, then you could use a TableLayoutPanel. That would allow you to describe a grid pattern with the Rows and Columns and then add your PictureBox controls to the grid.
There are other options, of course, depending upon your goal.
Replace picturebox.Image with Your resized Image, and use sizemode.AutoSize!
Related
I am adding PictureBoxes to a panel programatically. The Panel has a background image, and the pictureboxes have png's in them which contain areas of transparency.
I had thought that to get the transparency to work, they should be added with the Parent being assigned to the last control added - So the first PB has the parent=panel, PB2's parent is PB1 etc.
These PB's are small and don't always overlap any other PB. Where they don't, I get the behaviour I want, I can see the panel background fine. Where they do overlap however, I get the following:
The first image to be placed is fine. The second image to be placed is truncated where the first image overlaps it.
I am setting the parent like this
if (LastIndex == 0)
{
thumbnail.Parent = this.BoardPanel;
}
else
{
thumbnail.Parent = this.BoardPanel.Controls[LastIndex-1];
}
LastIndex++;
The weird thing is that I can always see the background image, so the transparency is working somewhere?
I have just started learning C# and Visual Studio trying to work both on books and on sample code.
I am aware that tis is not a very brilliant question, but this is the problem that I am trying to solve. I have a windows form and I need to show an image in a Picture box contained in a tableLayoutPanel. The simple problem is that the images I have to load could have several sizes and a typical image is not completely shown within the allocated space: only the area that fits the container is shown, the rest of the image is cutted off. I have to show the image in its entirety, i do not have to resize it. I have already set the autosize property, but this does not seems to work.
Here some code in the form.cs
string imageName = openFileDialog1.FileName; // Get the image name
// Read the image
try
{
img = ( Bitmap) Image .FromFile(imageName);
}
catch
{
MessageBox.Show("oooops" , Text, MessageBoxButtons.OK, MessageBoxIcon .Hand);
}
pictureBox1.Image = img; // show the image
and then in the private void InitializeComponent() found in the form.designer.cs:
this.flowLayoutPanel1 = new System.Windows.Forms.FlowLayoutPanel();
...
this.pictureBox1 = new System.Windows.Forms.PictureBox();
...
this.tableLayoutPanel1.Controls.Add(this.pictureBox1, 1, 1);
...
this.tableLayoutPanel1.Controls.Add(this.pictureBox1, 1, 1);
...
this.tableLayoutPanel1.RowStyles.Add(new System.Windows.Forms.RowStyle(System.Windows.Forms.SizeType.Percent, 9.034863F));
this.tableLayoutPanel1.RowStyles.Add(new System.Windows.Forms.RowStyle(System.Windows.Forms.SizeType.Percent, 2.388038F));
this.tableLayoutPanel1.RowStyles.Add(new System.Windows.Forms.RowStyle(System.Windows.Forms.SizeType.Percent, 88.5771F));
this.tableLayoutPanel1.Size = new System.Drawing.Size(784, 762);
...
this.pictureBox1.SizeMode = System.Windows.Forms.PictureBoxSizeMode.AutoSize;
Have you any hint about how to show the whole image?
Even using slidbars would be ok, but notwhithstanding the fact that the container has autoscroll = true, nothing happens and the image is still truncated.
Thanks for any help
The autoscroll property in the tableLayout control manage the scrolling of the whole table, including all the child controls. When the image is too big to fit within the picture control box, the autoscroll = yes property show slidebars allowing to slide all the content packed in the table layout control, not the individual image cell. Picture box does not have an autoscroll property, because autoscroll is, as far as I understand, a container's property; to slide the image in its own assigned space an intermediate container should be used, I guess.
My question was not a good question. It is rooted in my confusion about the containment hierarchy and relevant properties, more than in a genuine lack of knowledge or notions. Well, there is always room to improve ...
I would like to have a form in which the controls on the form are fully visible but the form itself is invisible. If I change the form's Opacity, this makes both the form and the controls on it semi-transparent, so this doesn't work.
I can't do this by setting the form's TransparencyKey, since I have a PictureBox on the form. If the image in the PictureBox happens to contain pixels that match the TransparencyKey, they appear as openings in the form, which I don't want.
TransparencyKey is the only way to get this. Pick the right color. Color.Fuchsia has a long tradition of being the color of choice, going back to the early days of Win32 development. Assault your eye with it to see its merits.
With the caveat that I've never used it, just ran across it once, thought "neat!" and moved on...
Look into System.Drawing.Drawing2D.GraphicsPath and setting the form's Region property. I added two buttons to the basic Windows forms application:
public Form1()
{
InitializeComponent();
Rectangle r1 = new Rectangle(button1.Location, button1.Size);
Rectangle r2 = new Rectangle(button2.Location, button2.Size);
GraphicsPath gp = new GraphicsPath();
gp.AddRectangle(r1);
gp.AddRectangle(r2);
this.Region = new Region(gp);
}
I've approximated the shape of the button with a rectangle; with this code, you can see the form background color at the buttons' corners. You'll need to work out the enclosing path for each of your controls and add them to the path individually. You'll need to take into account any offset introduced by the form title bar or border style.
Update: I did some investigation and have a couple of possible approaches for the problem:
Using the GraphicsPath method, set pictureBox.Visible to False if there is no image loaded.
When you load an image into the picture box, analyze the image to get a list of all the colors in it, then randomly generate one that isn't. Set the form's BackColor and TransparencyKey properties to match this new color, Hans Passant's answer.
.NET Framework / C# / Windows Forms
I'd like the FlowLayoutPanel to automatically adjust its width or height depending on number of controls inside of it. It also should change the number of columns/rows if there is not enough space (wrap its content). The problem is that if I set autosize then the flowlayoutpanel doesn't wrap controls I insert. Which solution is the best?
Thanks!
Set the FlowLayoutPanel's MaximumSize to the width you want it to wrap at. Set WrapContents = true.
Have you tried using the TableLayoutPanel? It's very useful for placing controls within cells.
There is no such thing like impossible in software development. Impossible just takes longer.
I've investigated the problem. If there is really need for Flow Layout, it can be done with a bit of work. Since FlowLayoutPanel lays out the controls without particularly thinking about the number of rows/columns, but rather on cumulative width/height, you may need to keep track of how many controls you've already added. First of all, set the autosize to false, then hook your own size management logic to the ControlAdded/ControlRemoved events. The idea is to set the width and height of the panel in such a way, that you'll get your desired number of 'columns' there
Dirty proof of concept:
private void flowLayoutPanel1_ControlAdded(object sender, ControlEventArgs e)
{
int count = this.flowLayoutPanel1.Controls.Count;
if (count % 4 == 0)
{
this.flowLayoutPanel1.Height = this.flowLayoutPanel1.Height + 70;
}
}
if the panel has initially width for 4 controls, it will generate row for new ones. ControlRemoved handler should check the same and decrease the panel height, or get all contained controls and place them again. You should think about it, it may not be the kind of thing you want. It depends on the usage scenarios. Will all the controls be of the same size? If not, you'd need more complicated logic.
But really, think about table layout - you can wrap it in a helper class or derive new control from it, where you'd resolve all the control placing logic. FlowLayout makes it easy to add and remove controls, but then the size management code goes in. TableLayout gives you a good mechanism for rows and columns, managing width and height is easier, but you'd need more code to change the placement of all controls if you want to remove one from the form dynamically.
If possible, I suggest you re-size the FlowLayoutPanel so that it makes use of all the width that is available and then anchor it at Top, Left and Right. This should make it grow in height as needed while still wrapping the controls.
I know this is an old thread but if anyone else wonders on here then here's the solution I produced - set autosize to true on the panel and call this extension method from the flow panel's Resize event:
public static void ReOrganise(this FlowLayoutPanel panel)
{
var width = 0;
Control prevChildCtrl = null;
panel.SuspendLayout();
//Clear flow breaks
foreach (Control childCtrl in panel.Controls)
{
panel.SetFlowBreak(childCtrl, false);
}
foreach (Control childCtrl in panel.Controls)
{
width = width + childCtrl.Width;
if(width > panel.Width && prevChildCtrl != null)
{
panel.SetFlowBreak(prevChildCtrl, true);
width = childCtrl.Width;
}
prevChildCtrl = childCtrl;
}
panel.ResumeLayout();
}
Are you adding the controls dynamically basing on the user's actions? I'm afraid you'd need to change the FlowLayout properties on the fly in code, when adding new controls to it, then refreshing the form would do the trick.
Does WinForms have support for this? Let's say I want to show a panel containing ListView made of some results. It is shown by clicking on a button in a form corner, and the panel is shown inside the form, above all controls, preferably with shadow in the back to make it more attractive.
I want this panel to be always inside the form, as a part of it. One solution that comes to my mind is to create a border-less form with that panel, and to make it in sync with original form.
Is there maybe some other way that I'm missing?
Here's a crude method that will get you started:
public Panel CreateFloatingPanel(Panel originalPanel)
{
Bitmap bmp = new Bitmap(originalPanel.Width,
originalPanel.Height);
Rectangle rect = new Rectangle(0, 0,
bmp.Width, bmp.Height);
originalPanel.DrawToBitmap(bmp, rect);
foreach (Control ctrl in originalPanel.Controls)
{
ctrl.Visible = false;
}
using (Graphics g = Graphics.FromHwnd(originalPanel.Handle))
{
g.DrawImage(bmp, 0, 0);
bmp.Dispose();
SolidBrush brush =
new SolidBrush(Color.FromArgb(128, Color.Gray));
g.FillRectangle(brush, rect);
brush.Dispose();
}
Panel floater = new Panel();
floater.Size = originalPanel.Size;
floater.Left = originalPanel.Left - 50;
floater.Top = originalPanel.Top - 50;
this.Controls.Add(floater);
floater.BringToFront();
return floater;
}
This method takes a panel with some controls on it, draws the panel with all its controls onto a temporary bitmap, makes all the controls invisible, draws the temporary bitmap onto the panel, then adds a semi-transparent Gray layer onto the panel. The method then creates a new panel and floats it over the original panel, above and to the left, and then returns it. This basically makes the new panel a sort of modal popup window, kind of like how web pages do it sometimes.
To use this on your form, put all the controls you want to be grayed-out underneath onto a panel, then have your button's Click event do something like this:
Panel floater = CreateFloatingPanel(panel1);
floater.BackColor = Color.White;
ListView lv = new ListView();
floater.Controls.Add(lv);
To undo the effect, you would just remove the floating panel from the form's Controls collection, then make visible again all the controls on the original panel, and then Refresh or Invalidate the panel to get rid of the grayed-out stuff. The simple Invalidate will work because the grayed-out effect does not persist - to get that you'd have to make this all a bit more complicated. But this should get you started, at least.
Could you just create a hidden Panel at the back of the Form, and then make it visible, and then bring it to front?