Scroll the page when a canvas is touch dragged

Scroll the page when a canvas is touch dragged

By : user2948553
Date : November 14 2020, 04:51 PM
will be helpful for those in need I was able to resolve this by:
Removing e.preventDefault(); Hooking up canvas[0].onselectstart = function () { return false; } to prevent text being selected when the canvas is double-clicked (this was what e.preventDefault() did in the first place) Replacing touchstart with touchend
code :

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MapBox scroll page on touch

MapBox scroll page on touch

By : Jasper Dil
Date : March 29 2020, 07:55 AM
Hope this helps This example has been improved: the line that was missing is:
if (map.tap) map.tap.disable();
How to prevent polymer scrolling page on touch screen during touch drag and drop procedures on a canvas?

How to prevent polymer scrolling page on touch screen during touch drag and drop procedures on a canvas?

By : Havauk
Date : March 29 2020, 07:55 AM
this one helps. Fortunately, I found the answer here: Using touch events with Createjs / Easeljs
A single line of code was required:
code :
How to use UIScrollview scroll to page when touch button

How to use UIScrollview scroll to page when touch button

By : Olimjon Matniyazov
Date : March 29 2020, 07:55 AM
hope this fix your issue I want a UIScrollView that works like: , suppose the height value of your one page is pageHeight,
code :
CGPoint contentOffset = yourScroll.contentOffset
contentOffset.y = pageHeight * pageIndex;
[yourScroll setContentOffset:contentOffset animated:YES];
Bind canvas to window when canvas is dragged in pyqt

Bind canvas to window when canvas is dragged in pyqt

By : Alex
Date : March 29 2020, 07:55 AM
hope this fix your issue If you want to drag the AppWindow you should register the dragging in this class, instead of the Figure canvas. Inside figure canvas you can then route the drag events to the AppWindow.
The following should work for you, where I did not change much of the code, just rearanged it, added the parent argument to GraphCanvas and let the dragging functions call their parent's functions.
code :
from PyQt4 import QtCore
from PyQt4 import QtGui
from matplotlib.figure import Figure
from matplotlib.backends.backend_qt4agg import FigureCanvasQTAgg as FigureCanvas

class GraphCanvas(FigureCanvas):
    def __init__(self, parent = None):
        self.parent = parent
        # The window
        self.fig = Figure(figsize=(5, 5), dpi=100)
        self.ax1 = self.fig.add_subplot(111)
        self.ax1.plot([1,2,3], [1,2,3], linewidth=2, color="#c6463d", label="line1")
        FigureCanvas.__init__(self, self.fig)

    def mousePressEvent(self, event):

    def mouseMoveEvent(self,event):

    def mouseReleaseEvent(self, event):

''' End Class '''

class AppWindow(QtGui.QWidget):
    def __init__(self, parent=None):
        super(AppWindow, self).__init__(parent)

        layout = QtGui.QVBoxLayout(self)
        cpu_canvas = GraphCanvas(self)

        self.draggable = True
        self.dragging_threshold = 5
        self.__mousePressPos = None
        self.__mouseMovePos = None

    def mousePressEvent(self, event):
        if self.draggable and event.button() == QtCore.Qt.LeftButton:
            self.__mousePressPos = event.globalPos()                # global
            self.__mouseMovePos = event.globalPos() - self.pos()    # local
        super(AppWindow, self).mousePressEvent(event)

    def mouseMoveEvent(self, event):
        if self.draggable and event.buttons() & QtCore.Qt.LeftButton:
            globalPos = event.globalPos()
            moved = globalPos - self.__mousePressPos
            if moved.manhattanLength() > self.dragging_threshold:
                # move when user drag window more than dragging_threshould
                diff = globalPos - self.__mouseMovePos
                self.__mouseMovePos = globalPos - self.pos()
        super(AppWindow, self).mouseMoveEvent(event)

    def mouseReleaseEvent(self, event):
        if self.__mousePressPos is not None:
            if event.button() == QtCore.Qt.LeftButton:
                moved = event.globalPos() - self.__mousePressPos
                if moved.manhattanLength() > self.dragging_threshold:
                    # do not call click event or so on
                self.__mousePressPos = None
        super(AppWindow, self).mouseReleaseEvent(event)

''' End Class'''

if __name__ == '__main__':
    import sys
    app = QtGui.QApplication(sys.argv)
    main = AppWindow()
disable page scroll on touch pad scroll inside forge viewer in firefox

disable page scroll on touch pad scroll inside forge viewer in firefox

By : user3220395
Date : March 29 2020, 07:55 AM
wish help you to fix your issue I seem to have figured out the issue, the viewer controls bind to the DOMMouseScroll and the mousewheel on the .canvas-wrap element. this is not enough for newer versions of firefox. The controls need to also bind to the "wheel" event which seems to be the standard event for handling mouse wheel action. the following acts as a temporary fix.
code :
document.getElementsByClassName("canvas-wrap")[0].addEventListener( 'wheel', NOP_VIEWER.impl.controls.mousewheel, false);
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