I've got a SciChartSurface where I support zooming as follows:
Zoom x-axis on regular scrolling.
Zoom y-axis on scrolling + CTRL
Pan x-axis on scrolling + Shift
I'd like to also enable panning in the X-direction when the user either scrolls horizontally on a trackpad or uses a horizontal scroll wheel (thumb-wheel). However, I'm not sure how to go about doing this.
Here's the extended MouseWheelZoomModifier I've been using. Can I somehow send it information about my scrolling behavior? Can I somehow just treat the sideways/horizontal scrolling as Shift + scroll? Thanks!
/// <summary>
/// Extended <see cref="MouseWheelZoomModifier"/> which modifies zoom
/// behavior based on modifier keys so that scrolling while holding CTRL
/// zooms vertically and doing so while holding SHIFT pans horizontally.
/// </summary>
class MouseWheelZoomModifierEx : MouseWheelZoomModifier {
public override void OnModifierMouseWheel(ModifierMouseArgs e) {
switch (e.Modifier) {
case MouseModifier.Ctrl:
ActionType = ActionType.Zoom;
XyDirection = XyDirection.YDirection;
break;
case MouseModifier.Shift:
ActionType = ActionType.Pan;
XyDirection = XyDirection.XDirection;
break;
default:
ActionType = ActionType.Zoom;
XyDirection = XyDirection.XDirection;
break;
}
// e.Modifier is set to None so that the base implementation of
// OnModifierMouseWheel doesn't change ActionType and XyDirection again.
e.Modifier = MouseModifier.None;
base.OnModifierMouseWheel(e);
}
}
In SciChart you can add any custom zoom and pan behaviors using the ChartModifierBase API.
As well as the standard methods which you can override (like OnModifierMouseWheel, OnModifierMouseDown, OnModifierMouseUp) you can also subscribe to events directly on the ParentSurface.
Have a look at this KB article: Custom ChartModifiers - Part 2 - Custom ZoomPanModifier and Zooming on KeyPress.
Up to date accompanying source code is here.
So my suggestion is take the SimpleZoomInOutModifier and modify it to respond to mouse wheel events instead of key events.
Does that help?
Related
How can I implement following design functionality with android standard component bottom sheet:
Image when Bottom sheet dialog fragment will appear:
Image when user scrolled to up to view bottom of content:
I will use ViewPager to scrolling header images and RecyclerView to showing descriptions and other informations. And parallax effect to ImageView(which are placed in ViewPager) when scrolling content vertically. Have a minimum height of the ImageView(and ViewPager), user can't collapse fully it (Look to second screenshot, which is user scrolled until the end of content).
I want stop scrolling ImageView when it will reach to minimum height(look to second one Screenshot), but the content of below ImageView should be continue scrolling
This can be done with an if statement in an on scroll view such as shown below:
ScrollView scrollView = findViewById(R.id.scrollView); //Adjust for your code
ImageView imageView = findViewById(R.id.imageView); //Adjust for your code
boolean imageIsHidden = false;
int threshold = 250;
scrollView.getViewTreeObserver().addOnScrollChangedListener(new OnScrollChangedListener() {
#Override
public void onScrollChanged() {
int scrollY = rootScrollView.getScrollY();
if(scrollY >= threshold){
imageIsHidden = true;
//Move image outside of scroll view so it doesn't scroll
}
else if(scrollY < threshold && imageIsHidden){
imageIsHidden = false;
//Move image inside of scroll view so it does scroll
}
}
});
What this does is has a boolean called imageIsHidden and an integer called threshold. Threshold is where you want it to make it disappear. You will need to play around with this value to find a sweet spot.
You will also need to implement moving the image inside and outside of the scroll view as well in the if and if else statement.
this.canvas = new Canvas(shell, SWT.NO_BACKGROUND);
I'm using a PaintListener:
this.canvas.addPaintListener(new PaintListener() {
#Override
public void paintControl(PaintEvent e) {
// Draw images
synchronized (imageMarks) {
for (ImageMark mark : Whiteboard.this.imageMarks)
{
Image image = Whiteboard.this.getImage(mark.id);
Point position = ScaledPoint.toSWTPoint(Whiteboard.this.getCanvasSize(), mark.getPosition());
Point bounds = mark.getUnscaledBoundaries(Whiteboard.this.getCanvasSize());
e.gc.drawImage(image, 0, 0, image.getBounds().width, image.getBounds().height, position.x, position.y,
bounds.x, bounds.y);
}
}
// Draw pencil marks
synchronized (pencilMarks) {
e.gc.setLineWidth(LINE_WIDTH);
for (double[] line : Whiteboard.this.pencilMarks)
{
Point lastPosPoint = ScaledPoint.toSWTPoint(Whiteboard.this.getCanvasSize(), new ScaledPoint(line[0], line[2]));
Point newPosPoint = ScaledPoint.toSWTPoint(Whiteboard.this.getCanvasSize(), new ScaledPoint(line[1], line[3]));
e.gc.drawLine(lastPosPoint.x, lastPosPoint.y, newPosPoint.x, newPosPoint.y);
}
}
// Draw pointer, assuming it's there
if (pointerMark != null)
{
synchronized (pointerMark) {
Point pos = ScaledPoint.toSWTPoint(Whiteboard.this.getCanvasSize(), pointerMark.getPosition());
if (pointerMark.isFlipped())
e.gc.drawImage(Whiteboard.pointerImageFlipped, pos.x, pos.y);
else
e.gc.drawImage(Whiteboard.pointerImage, pos.x, pos.y);
}
}
}
});
and redrawing the canvas via a canvas.redraw() call. On 64-bit Linux, this seems to be working without any issues, but strangely enough, on 64-bit Windows, nothing ever ends up being erased or redrawn. For example, if the screen is resized, the pencil markings do not resize as well, they just end up being cut out of the screen. When new marks are added (in other words, when the paint listener is called again), the repositioned markings are redrawn on top of the old ones which didn't scale with the window. In other words, I believe the canvas is not being cleared upon canvas.redraw(). Is there a workaround for this?
You are specifying SWT.NO_BACKGROUND which stops the Canvas being cleared before each paint.
If you use SWT.NO_BACKGROUND it is your paint method's responsibility to draw every pixel of the Canvas.
SWT.NO_BACKGROUND JavaDoc:
By default, before a widget paints, the client area is filled with the
current background. When this style is specified, the background is
not filled, and the application is responsible for filling every pixel
of the client area. This style might be used as an alternative to
"double-buffering" in order to reduce flicker. This style does not
mean "transparent" - widgets that are obscured will not draw through.
I want to add close button to top right corner of a dialog box.
I tried using setbounds with addactor and just add and setposition with setsize and addactor, but nothing works. I know that dialog works with table layout, it has a table for content and for buttons. I don't want to use this layout and put the button outside this layout like on the border of the dialog.
How can I do it?
This is how it should be:
The easiest solution I could come up with now, is to use negative padding for your button to move it "outside" of it's cell.
Button closeButton = new TextButton("X", skin, "default");
getTitleTable().add(closeButton).size(60, 40).padRight(-30).padTop(-20);
With this padding hack you have the problem, that the button will be outside of your Dialog, and by default, Window checks the bounds of your window when it performs Actor.hit(...) evaluation.
We need to disable clipping for that reason, but the rendering of the window depends on it. That's why we use another hack to enable it, just for the rendering:
#Override
public void draw(Batch batch, float parentAlpha) {
setClip(true);
super.draw(batch, parentAlpha);
setClip(false);
}
Do this:
private Stage stage;
private Window window;
private Table table;
#Override
public void show() {
table = new Table();
table.setSize(Gdx.graphics.getWidth() / 2
, Gdx.graphics.getHeight() / 5);
window = new Window("", skin);
window.setSize(table.getWidth(), table.getHeight());
Button btnWindow = new Button(skin, "close");
btnWindow.addListener(new ClickListener() {
#Override
public void clicked(InputEvent event, float x, float y) {
window.setVisible(false);
}
});
window.addActor(btnWindow);
btnWindow.setSize(50, 50);
btnWindow.setPosition(window.getWidth() - btnWindow.getWidth()
, window.getHeight() - btnWindow.getHeight());
table.addActor(window);
window.setModal(true);
table.setPosition(Gdx.graphics.getWidth() / 2 - window.getWidth() / 2
, Gdx.graphics.getHeight() / 2 - window.getHeight() / 2 +
100);
window.addAction(Actions.sequence(Actions.alpha(0)
, Actions.fadeIn(.1f)
, Actions.moveTo(+50, +50, 1)));
stage.addActor(table);
}
I had a similar problem. After a bit of searching this thread helped me.
Basically to tell the alignment of the actors inside a table, and to tell the alignment of the table itself are two separate things. Setting the alignment of the table top top-left would produce the desired behavior.
table = new Table();
table.setFillParent(true);
table.setSkin(usedSkin);
table.setDebug(true);
table.top().left();
stage.addActor(table);
table.add(exitBtn);
I am trying to draw a GtkLayout using cairo. The layout is huge and I need to get the part that is visible in the container window and update that part only. With GTK2 the expose event data was sufficient to do this. I am not successful with GTK3.
In the function to handle "draw" events, I did the following:
GdkWindow *gdkwin; // window to draw
cairo_region_t *cregion; // update regions
cairo_rectangle_int_t crect; // enclosing rectangle
gdkwin = gtk_layout_get_bin_window(GTK_LAYOUT(layout));
cregion = gdk_window_get_update_area(gdkwin);
cairo_region_get_extents(cregion,&crect);
expy1 = crect.y; // top of update area
expy2 = expy1 + crect.height; // bottom of update area
The problem is that cregion has garbage. Either gdk_window_get_update_area() is buggy or I am not using the right drawing window.
Passing the GtkLayout as follows also does not work (this is the function arg for g_signal_connect):
void draw_function(GtkWidget *layout, cairo_t *cr, void *userdata)
Whatever gets passed is not the GtkLayout from g_signal_connect, but something else.
================= UPDATE ====================
I found a way to do what I want without using GtkLayout.
I am using a GtkDrawingArea inside a viewport.
I can scroll to any window within the large graphic layout
and update that window only. Works well once I figured out
the cryptic docs.
scrwing = gtk_scrolled_window_new(0,0);
gtk_container_add(GTK_CONTAINER(vboxx),scrwing);
drwing = gtk_drawing_area_new();
gtk_scrolled_window_add_with_viewport(GTK_SCROLLED_WINDOW(scrwing),drwing);
gtk_scrolled_window_set_policy(SCROLLWIN(scrwing),ALWAYS,ALWAYS);
scrollbar = gtk_scrolled_window_get_vadjustment(GTK_SCROLLED_WINDOW(scrwing));
I have a view with 4 text boxes and and a logo at the top - when the user is entering information the text pad covers up some of these controls, how can I make the view scroll so that this isn't an issue.
I have tried adding the view to a UIScrollView but that doesn't seem to do anything?
I've included a snippit below of how I've handled your situation. If I'm understanding you correctly, you do not wish to have a scrollable view, rather you want to the view to move in conjunction with switching to and from fields to alleviate and visual hindrances caused by the keyboard.
Goodluck!
private void ScrollTheView(bool movedUp, float scrollamount, UIView ViewToMove)
{
//To invoke a views built-in animation behaviour,
//you create an animation block and
//set the duration of the move...
//Set the display scroll animation and duration...
UIView.BeginAnimations(string.Empty, System.IntPtr.Zero);
UIView.SetAnimationDuration(0.15);
//Get Display size...
RectangleF frame = ViewToMove.Frame;
if (movedUp) {
//If the view should be moved up,
//subtract the keyboard height from the display...
frame.Y -= scrollamount;
}
else {
//If the view shouldn't be moved up, restore it
//by adding the keyboard height back to the original...
frame.Y += scrollamount;
}
//Assign the new frame to the view...
ViewToMove.Frame = frame;
//Tell the view that your all done with setting
//the animation parameters, and it should
//start the animation...
UIView.CommitAnimations();
}
You need to set more to the UIScrollView than just put subviews in it. Set up the ContentSize property properly for the complete size of the subviews so the scrollview knows about the larger content in it, than you can control the scrolling position, zoom factor and so on.
There are plenty of samples on iOS SDK, just check the UIScrollView documentation, transformation to Monotouch from ObjectiveC is straightforward or check blog post at http://blog.touch4apps.com/home/iphone-monotouch-development/monotouch-infinite-loop-image-scroll-view where I have a sample with images autoscrolled in UIScrollView.
something like this.
textBox.EditingDidBegin += delegate {
var offset = scrollView.contentOffset;
offset.Y -= 200;
scrollView.contentOffset = offset;
}