I have created a usercontrol just to contain an Image, because I haveto use Measureoverride and arrangeoverride methods and I can't create a subclass (Image is seled)... anyway, the thing is that when i call this.Image.Measure(SizeIwantto giveto the image) the desiredSize field of the image is not set... anybody know why?
I have been managing the Layouting methods before and It worked...
Here is the code (I have already checked all the other sizes and none of them is 0 or NaN)
protected override Size MeasureOverride(Size availableSize)
{
//the size that the element wants to have
Size imageDesiredSize = new Size();
imageDesiredSize = availableSize;
//if the current element's size is a pertentage
if ((futureHeight != 0))
{
imageDesiredSize.Height = availableSize.Height * futureHeight / 100;
}
if ((futureWidth != 0))
{
imageDesiredSize.Width = availableSize.Width * futureWidth / 100;
}
if (widthWrap)
{
imageDesiredSize.Width = ((BitmapImage)this.Source).PixelWidth;
}
if (heightWrap)
{
imageDesiredSize.Height = ((BitmapImage)this.Source).PixelHeight;
}
System.Diagnostics.Debug.WriteLine("imagedesired" + imageDesiredSize);
this.image.Measure(imageDesiredSize);
System.Diagnostics.Debug.WriteLine("desiredsize" + this.image.DesiredSize);
return imageDesiredSize;
}
In the end It was a really simple solution... In the constructor of the UserControl I added this line: this.Content = image;
And now the content of the Usercontrol is drawn in the screen :-)
Related
I'm trying to programmatically add a MouseEntered event to a custom NSButton class, and I can't seem to get it to fire. I'm writing a Mac OS application in Visual Studio for Mac, using Xamarin.Mac. I need to add the event in code because I'm creating the buttons dynamically.
Here's my ViewController where these buttons are being created. They're instantiated in the DrawHexMap method near the bottom.
public partial class MapController : NSViewController
{
public MapController (IntPtr handle) : base (handle)
{
}
public override void ViewDidLoad()
{
base.ViewDidLoad();
DrawHexMap();
}
partial void GoToHex(Foundation.NSObject sender)
{
string[] coordinateStrings = ((NSButton)sender).Title.Split(',');
Hex chosenHex = HexRepo.GetHex(coordinateStrings[0], coordinateStrings[1]);
HexService.currentHex = chosenHex;
NSTabViewController tp = (NSTabViewController)ParentViewController;
tp.TabView.SelectAt(1);
}
private void DrawHexMap()
{
double height = 60;
for (int x = 0; x < 17; x++) {
for (int y = 0; y < 13; y++) {
HexButton button = new HexButton(x, y, height);
var handle = ObjCRuntime.Selector.GetHandle("GoToHex:");
button.Action = ObjCRuntime.Selector.FromHandle(handle);
button.Target = this;
View.AddSubview(button);
}
}
}
}
And here's the custom button class.
public class HexButton : NSButton
{
public NSTrackingArea _trackingArea;
public HexButton(int x, int y, double height)
{
double width = height/Math.Sqrt(3);
double doubleWidth = width * 2;
double halfHeight = height/2;
double columnNudge = decimal.Remainder(x, 2) == 0 ? 0 : halfHeight;
Title = x + "," + y;
//Bordered = false;
//ShowsBorderOnlyWhileMouseInside = true;
SetFrameSize(new CGSize(width, height));
SetFrameOrigin(new CGPoint(width + (x * doubleWidth), (y * height) + columnNudge));
_trackingArea = new NSTrackingArea(Frame, NSTrackingAreaOptions.ActiveInKeyWindow | NSTrackingAreaOptions.MouseEnteredAndExited, this, null);
AddTrackingArea(_trackingArea);
}
public override void MouseEntered(NSEvent theEvent)
{
base.MouseEntered(theEvent);
Console.WriteLine("mouse enter");
}
}
So as you can see, I'm creating a tracking area for the button and adding it in the constructor. Yet I can't seem to get a MouseEntered to fire. I know the MouseEntered override in this class works, because when I call button.MouseEntered() directly from my code, the method fires.
A few other things I've tried include: Commenting out the lines that set the Action and Target in the ViewController, in case those were overriding the MouseEntered handler somehow. Setting those values inside the HexButton constructor so that the Target was the button instead of the ViewController. Putting the MouseEntered override in the ViewController instead of the button class. Creating the tracking area after the button was added as a subview to the ViewController. None of these made a difference.
Any help would be much appreciated! It's quite difficult to find documentation for Xamarin.Mac...
Thanks!
You are adding the Frame as the region tracked, but you are attaching the tracking area to the view that you are creating the region from, thus you need to track the Bounds coords.
_trackingArea = new NSTrackingArea(Bounds, NSTrackingAreaOptions.ActiveInKeyWindow | NSTrackingAreaOptions.MouseEnteredAndExited, this, null);
Note: If you were tracking from the view that you are adding the buttons to, then you would need to track the "Frame" as it is the tracking region is relative to the view being tracked, not its children.
I have a quite simple unity GUI that has the following scheme :
Where Brekt and so are buttons.
The GUI works just fine on PC and is on screen space : overlay so it is supposed to be adapted automatically to fit every screen.
But on tablet the whole GUI is smaller and reduced in the center of the screen, with huge margins around the elements (can't join a screenshot now)
What is the way to fix that? Is it something in player settings or in project settings?
Automatically scaling the UI requires using combination of anchor,pivot point of RecTransform and the Canvas Scaler component. It is hard to understand it without images or videos. It is very important that you thoroughly understand how to do this and Unity provided full video tutorial for this.You can watch it here.
Also, when using scrollbar, scrollview and other similar UI controls, the ContentSizeFitter component is also used to make sure they fit in that layout.
There is a problem with MovementRange. We must scale this value too.
I did it so:
public int MovementRange = 100;
public AxisOption axesToUse = AxisOption.Both; // The options for the axes that the still will use
public string horizontalAxisName = "Horizontal"; // The name given to the horizontal axis for the cross platform input
public string verticalAxisName = "Vertical"; // The name given to the vertical axis for the cross platform input
private int _MovementRange = 100;
Vector3 m_StartPos;
bool m_UseX; // Toggle for using the x axis
bool m_UseY; // Toggle for using the Y axis
CrossPlatformInputManager.VirtualAxis m_HorizontalVirtualAxis; // Reference to the joystick in the cross platform input
CrossPlatformInputManager.VirtualAxis m_VerticalVirtualAxis; // Reference to the joystick in the cross platform input
void OnEnable()
{
CreateVirtualAxes();
}
void Start()
{
m_StartPos = transform.position;
Canvas c = GetComponentInParent<Canvas>();
_MovementRange = (int)(MovementRange * c.scaleFactor);
Debug.Log("Range:"+ _MovementRange);
}
void UpdateVirtualAxes(Vector3 value)
{
var delta = m_StartPos - value;
delta.y = -delta.y;
delta /= _MovementRange;
if (m_UseX)
{
m_HorizontalVirtualAxis.Update(-delta.x);
}
if (m_UseY)
{
m_VerticalVirtualAxis.Update(delta.y);
}
}
void CreateVirtualAxes()
{
// set axes to use
m_UseX = (axesToUse == AxisOption.Both || axesToUse == AxisOption.OnlyHorizontal);
m_UseY = (axesToUse == AxisOption.Both || axesToUse == AxisOption.OnlyVertical);
// create new axes based on axes to use
if (m_UseX)
{
m_HorizontalVirtualAxis = new CrossPlatformInputManager.VirtualAxis(horizontalAxisName);
CrossPlatformInputManager.RegisterVirtualAxis(m_HorizontalVirtualAxis);
}
if (m_UseY)
{
m_VerticalVirtualAxis = new CrossPlatformInputManager.VirtualAxis(verticalAxisName);
CrossPlatformInputManager.RegisterVirtualAxis(m_VerticalVirtualAxis);
}
}
public void OnDrag(PointerEventData data)
{
Vector3 newPos = Vector3.zero;
if (m_UseX)
{
int delta = (int)(data.position.x - m_StartPos.x);
delta = Mathf.Clamp(delta, -_MovementRange, _MovementRange);
newPos.x = delta;
}
if (m_UseY)
{
int delta = (int)(data.position.y - m_StartPos.y);
delta = Mathf.Clamp(delta, -_MovementRange, _MovementRange);
newPos.y = delta;
}
transform.position = new Vector3(m_StartPos.x + newPos.x, m_StartPos.y + newPos.y, m_StartPos.z + newPos.z);
UpdateVirtualAxes(transform.position);
}
In a GTK# application, I am using a TreeView inside a ScrolledWindow, and try to find the position of an item inside the TreeStore to draw lines starting from that item in Cairo. For now, I am using a hard coded value for cell height, which works for few items, but when other font sizes are used or the item list gets longer, there is a visible offset. Is there a method to get the cell height of a TreeView, or another way to get the vertical position of an item in the TreeStore?
Here is the method, that I currently use:
int GetYPositionForPort (TreeView tree, TreeStore store, Port selectedPort)
{
// Is there a way to get the cell height?
int cellHeight = 24;
// We start in the middle of the first Treeview item
int position = cellHeight / 2;
ScrolledWindow treeParent = tree.Parent as ScrolledWindow;
if (treeParent != null) {
position -= Convert.ToInt32 (treeParent.Vadjustment.Value);
}
TreeIter clientIter;
TreeIter portIter;
if (store.GetIterFirst (out clientIter)) {
do {
if (store.IterHasChild (clientIter)
&& tree.GetRowExpanded (store.GetPath (clientIter))) {
if (store.IterChildren (out portIter, clientIter)) {
do {
position += cellHeight;
} while (((Port)store.GetValue(portIter, 0) != selectedPort
|| (Client)store.GetValue(clientIter, 0) != selectedPort.Client)
&& store.IterNext(ref portIter));
}
}
//Necessary because the first Treeview item only counts as 1/2 cell height.
if (((Client)store.GetValue (clientIter, 0)) == selectedPort.Client) {
break;
}
position += cellHeight;
} while (store.IterNext(ref clientIter));
}
return position;
}
You can see the error on the bottom of the screenshot where the lines are not aligned with the items in the TreeView:
Reading the documentation, I have come up with the following ugly piece of code:
int GetCellHeight (TreeView tree)
{
if (_cellHeight > 0) {
return _cellHeight;
}
int offsetX;
int offsetY;
int cellWidth;
Gdk.Rectangle rectangle = new Gdk.Rectangle ();
TreeViewColumn column = tree.GetColumn (0);
// Getting dimensions from TreeViewColumn
column.CellGetSize(rectangle, out offsetX, out offsetY,
out cellWidth, out _cellHeight);
// And now get padding from CellRenderer
CellRenderer renderer = column.CellRenderers[0];
_cellHeight += (int)renderer.Ypad;
return _cellHeight;
}
This is what it looks like now:
Is there an equivalent to contentWidth and contentHeight for spark images?
I can get the size of the image component itself, as well as the sourceWidth and sourceHeight properties to get the unscaled size of the image.
But I can't work out the scaled image width and height of the source as displayed in the image component.
Any help greatly appreciated.
Was just trying to solve this exact issue. An adequate solution I found was to use IMAGE_ID.transform.pixelBounds.height (or width). Note that this won't be set until after the updateComplete event fires for the image. No idea why FLEX doesn't have a simple scaledWidth property.
Try extending the Spark Image component to include 2 new read-only properties to provide the scaled width and height as an equivalent to contentWidth and contentHeight.
The following will create 2 new bindable properties to return the actual scaled width and height of the image displayed inside the Spark Image component.
/**
* Returns the width of the image display taking into account the actual
* constraints of the container. If no scaling has occurred the actual
* width of the control is returned.
*/
[Bindable(event="scaledWidthChanged")]
public function get scaledWidth():Number
{
var num:Number = this.width;
if (scaleMode == "letterbox")
{
try
{
if ( (width > 0) && (sourceWidth < sourceHeight) )
{
num = (sourceWidth/sourceHeight) * width;
}
}
catch(e:Error)
{
num = this.width;
}
}
return num;
}
/**
* Returns the height of the image display taking into account the actual
* constraints of the container. If no scaling has occurred the actual
* height of the control is returned.
*/
[Bindable(event="scaledHeightChanged")]
public function get scaledHeight():Number
{
var num:Number = this.width;
if (scaleMode == "letterbox")
{
try
{
if ((height > 0) && (sourceHeight < sourceWidth))
{
num = (sourceHeight/sourceWidth) * height;
}
}
catch(e:Error)
{
num = this.height;
}
}
return num;
}
I'm new to Windows Forms, in my project, i need to change the image in the picture box at runtime. I'm able to do that with the help of a timer. The picture just gets changed. Is it possible to do some transitions when image changes, for example fade in, fade out, blur etc.. If possible could some one please let me know how to do it. I searched in net but in vain.Thanks in advance.
Varun
Simply take new code file and paste below code in it
an original answer for the similar question, answer taken from another question
Answer
using System;
using System.Drawing;
using System.Drawing.Imaging;
using System.Windows.Forms;
public class BlendPanel : Panel
{
private Image mImg1;
private Image mImg2;
private float mBlend;
public BlendPanel()
{
SetStyle(ControlStyles.AllPaintingInWmPaint | ControlStyles.UserPaint | ControlStyles.OptimizedDoubleBuffer, true);
}
public Image Image1
{
get { return mImg1; }
set { mImg1 = value; Invalidate(); }
}
public Image Image2
{
get { return mImg2; }
set { mImg2 = value; Invalidate(); }
}
public float Blend
{
get { return mBlend; }
set { mBlend = value; Invalidate(); }
}
protected override void OnPaint(PaintEventArgs e)
{
if (mImg1 == null || mImg2 == null)
e.Graphics.FillRectangle(new SolidBrush(this.BackColor), new Rectangle(0, 0, this.Width, this.Height));
else
{
Rectangle rc = new Rectangle(0, 0, this.Width, this.Height);
ColorMatrix cm = new ColorMatrix();
ImageAttributes ia = new ImageAttributes();
cm.Matrix33 = mBlend;
ia.SetColorMatrix(cm);
e.Graphics.DrawImage(mImg2, rc, 0, 0, mImg2.Width, mImg2.Height, GraphicsUnit.Pixel, ia);
cm.Matrix33 = 1F - mBlend;
ia.SetColorMatrix(cm);
e.Graphics.DrawImage(mImg1, rc, 0, 0, mImg1.Width, mImg1.Height, GraphicsUnit.Pixel, ia);
}
base.OnPaint(e);
}
}
Build your project. You can now drop a BlendPanel from the top of the toolbox onto your form. Here's a sample program that uses it:
private float mBlend;
private int mDir = 1;
public int count = 0;
public Bitmap[] pictures;
public void myPhoto()
{
pictures = new Bitmap[9];
pictures[0] = new Bitmap(#"Library Images\cf3.jpg");
pictures[1] = new Bitmap(#"Library Images\cf4.jpg");
pictures[2] = new Bitmap(#"Library Images\l1.JPG");
pictures[3] = new Bitmap(#"Library Images\l2.JPG");
pictures[4] = new Bitmap(#"Library Images\l3.JPG");
pictures[5] = new Bitmap(#"Library Images\l4.JPG");
pictures[6] = new Bitmap(#"Library Images\l5.JPG");
pictures[7] = new Bitmap(#"Library Images\l6.JPG");
pictures[8] = new Bitmap(#"Library Images\l7.JPG");
timer1.Interval = 50; //time of transition
timer1.Tick += BlendTick;
try
{
blendPanel1.Image1 = pictures[count];
blendPanel1.Image2 = pictures[++count];
}
catch
{
}
timer1.Enabled = true;
}
private void BlendTick(object sender, EventArgs e)
{
mBlend += mDir * 0.02F;
if (mBlend > 1)
{
mBlend = 0.0F;
if ((count + 1) < pictures.Length)
{
blendPanel1.Image1 = pictures[count];
blendPanel1.Image2 = pictures[++count];
}
else
{
blendPanel1.Image1 = pictures[count];
blendPanel1.Image2 = pictures[0];
count = 0;
}
}
blendPanel1.Blend = mBlend;
}
You'll need to modify the new Bitmap(#"yourimagePath"); calls. Build and run. You should see the displayed image smoothly morph from your first image to your second image without any flickering.
I hope it helps for other...
There is no built-in support for such effects, but you can implement them. I'd suggest to write a custom control that renders the image and have a method for fade-swap, fade itself can be reached with alpha-blending drawing with .NET Graphics class.
However, Graphics class isn't very fast, I don't recommend to use this technique for big images. If you need some fancy UI with hw-accelerated effects, take a look at WPF.
Blend effects are easy to get going by using the ColorMatrix class. There's a good example available in my answer in this thread.
A simple way to get a blur is to resize the image, making it smaller, then redraw it back, making it larger. The Graphics.InterpolationMode property affects the type of blur you'll get.
Those are quicky do-it-yourself solutions. Any decent graphics library has these kind of operations built-in. You probably want something free, check out ImageMagick.NET
To put it simply, not without external (3rd-party) libraries.