How to drag an Openseadrago canvas with mouse middle wheel button

I am using Openseadragon library with fabricjs overlay. I have a case where I want to drag the canvas but instead of mouse primary button, I want to drag it with middle mouse button press. Could anyone please help me get the desired behavior?

edited Nov 26 '18 at 11:46

Vadim Kotov

4,37953247

asked Nov 20 '18 at 6:19

Fateh

103

add a comment |

edited Nov 26 '18 at 11:46

Vadim Kotov

4,37953247

asked Nov 20 '18 at 6:19

Fateh

103

add a comment |

edited Nov 26 '18 at 11:46

Vadim Kotov

4,37953247

asked Nov 20 '18 at 6:19

Fateh

103

javascript javascript-events mouse fabricjs openseadragon

edited Nov 26 '18 at 11:46

Vadim Kotov

4,37953247

asked Nov 20 '18 at 6:19

Fateh

103

edited Nov 26 '18 at 11:46

Vadim Kotov

4,37953247

asked Nov 20 '18 at 6:19

Fateh

103

edited Nov 26 '18 at 11:46

Vadim Kotov

4,37953247

edited Nov 26 '18 at 11:46

Vadim Kotov

4,37953247

edited Nov 26 '18 at 11:46

Vadim Kotov

4,37953247

asked Nov 20 '18 at 6:19

Fateh

103

asked Nov 20 '18 at 6:19

Fateh

103

asked Nov 20 '18 at 6:19

Fateh

103

add a comment |

1 Answer
1

active

oldest

votes

OpenSeadragon doesn't have a flag for that, but you can easily build it using the MouseTracker. Here's an example (coded from memory and not tested, but it should give you the idea).

var drag;



var mouseTracker = new OpenSeadragon.MouseTracker({

  element: viewer.container, 

  nonPrimaryPressHandler: function(event) {

    if (event.button === 1) { // Middle

      drag = { 

        lastPos: event.position.clone()

      };

    }

  },

  moveHandler: function(event) {

    if (drag) {

      var deltaPixels = drag.lastPos.minus(event.position);

      var deltaPoints = viewer.viewport.deltaPointsFromPixels(deltaPixels);

      viewer.viewport.panBy(deltaPoints);

      drag.lastPos = event.position.clone();

    }

  },

  nonPrimaryReleaseHandler: function(event) {

    if (event.button === 1) {

      drag = null;

    }

  }

});

EDIT: I had a bug in the example code above; fixed.

edited Dec 11 '18 at 0:54

answered Nov 28 '18 at 18:23

iangilman

1,2841810

I am able to drag the canvas with mouse middle wheel button but canvas movement is very fast.

– Fateh
Dec 6 '18 at 12:58

Here is the plunker: plnkr.co/edit/t5kUse2ztmdyoDKTyAjZ?p=preview

– Fateh
Dec 6 '18 at 15:03

I see! I made the mistake in my first example of converting the position to viewport coordinates too soon; the fact that the viewport was moving around caused the points to be inaccurate. I'm now saving the position in web coordinates and converting to viewport at the last minute, which creates the right result. I also had the minus backward so it was going in the wrong direction. Let me know if this works now!

– iangilman
Dec 11 '18 at 0:57

yes, now it's perfect.

– Fateh
Dec 13 '18 at 12:02

Excellent; glad to hear it! :)

– iangilman
Dec 13 '18 at 17:35

add a comment |

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1 Answer
1

active

oldest

votes

1 Answer
1

active

oldest

votes

OpenSeadragon doesn't have a flag for that, but you can easily build it using the MouseTracker. Here's an example (coded from memory and not tested, but it should give you the idea).

var drag;



var mouseTracker = new OpenSeadragon.MouseTracker({

  element: viewer.container, 

  nonPrimaryPressHandler: function(event) {

    if (event.button === 1) { // Middle

      drag = { 

        lastPos: event.position.clone()

      };

    }

  },

  moveHandler: function(event) {

    if (drag) {

      var deltaPixels = drag.lastPos.minus(event.position);

      var deltaPoints = viewer.viewport.deltaPointsFromPixels(deltaPixels);

      viewer.viewport.panBy(deltaPoints);

      drag.lastPos = event.position.clone();

    }

  },

  nonPrimaryReleaseHandler: function(event) {

    if (event.button === 1) {

      drag = null;

    }

  }

});

EDIT: I had a bug in the example code above; fixed.

edited Dec 11 '18 at 0:54

answered Nov 28 '18 at 18:23

iangilman

1,2841810

I am able to drag the canvas with mouse middle wheel button but canvas movement is very fast.

– Fateh
Dec 6 '18 at 12:58

Here is the plunker: plnkr.co/edit/t5kUse2ztmdyoDKTyAjZ?p=preview

– Fateh
Dec 6 '18 at 15:03

I see! I made the mistake in my first example of converting the position to viewport coordinates too soon; the fact that the viewport was moving around caused the points to be inaccurate. I'm now saving the position in web coordinates and converting to viewport at the last minute, which creates the right result. I also had the minus backward so it was going in the wrong direction. Let me know if this works now!

– iangilman
Dec 11 '18 at 0:57

yes, now it's perfect.

– Fateh
Dec 13 '18 at 12:02

Excellent; glad to hear it! :)

– iangilman
Dec 13 '18 at 17:35

add a comment |

OpenSeadragon doesn't have a flag for that, but you can easily build it using the MouseTracker. Here's an example (coded from memory and not tested, but it should give you the idea).

var drag;



var mouseTracker = new OpenSeadragon.MouseTracker({

  element: viewer.container, 

  nonPrimaryPressHandler: function(event) {

    if (event.button === 1) { // Middle

      drag = { 

        lastPos: event.position.clone()

      };

    }

  },

  moveHandler: function(event) {

    if (drag) {

      var deltaPixels = drag.lastPos.minus(event.position);

      var deltaPoints = viewer.viewport.deltaPointsFromPixels(deltaPixels);

      viewer.viewport.panBy(deltaPoints);

      drag.lastPos = event.position.clone();

    }

  },

  nonPrimaryReleaseHandler: function(event) {

    if (event.button === 1) {

      drag = null;

    }

  }

});

EDIT: I had a bug in the example code above; fixed.

edited Dec 11 '18 at 0:54

answered Nov 28 '18 at 18:23

iangilman

1,2841810

I am able to drag the canvas with mouse middle wheel button but canvas movement is very fast.

– Fateh
Dec 6 '18 at 12:58

Here is the plunker: plnkr.co/edit/t5kUse2ztmdyoDKTyAjZ?p=preview

– Fateh
Dec 6 '18 at 15:03

I see! I made the mistake in my first example of converting the position to viewport coordinates too soon; the fact that the viewport was moving around caused the points to be inaccurate. I'm now saving the position in web coordinates and converting to viewport at the last minute, which creates the right result. I also had the minus backward so it was going in the wrong direction. Let me know if this works now!

– iangilman
Dec 11 '18 at 0:57

yes, now it's perfect.

– Fateh
Dec 13 '18 at 12:02

Excellent; glad to hear it! :)

– iangilman
Dec 13 '18 at 17:35

add a comment |

OpenSeadragon doesn't have a flag for that, but you can easily build it using the MouseTracker. Here's an example (coded from memory and not tested, but it should give you the idea).

var drag;



var mouseTracker = new OpenSeadragon.MouseTracker({

  element: viewer.container, 

  nonPrimaryPressHandler: function(event) {

    if (event.button === 1) { // Middle

      drag = { 

        lastPos: event.position.clone()

      };

    }

  },

  moveHandler: function(event) {

    if (drag) {

      var deltaPixels = drag.lastPos.minus(event.position);

      var deltaPoints = viewer.viewport.deltaPointsFromPixels(deltaPixels);

      viewer.viewport.panBy(deltaPoints);

      drag.lastPos = event.position.clone();

    }

  },

  nonPrimaryReleaseHandler: function(event) {

    if (event.button === 1) {

      drag = null;

    }

  }

});

EDIT: I had a bug in the example code above; fixed.

edited Dec 11 '18 at 0:54

answered Nov 28 '18 at 18:23

iangilman

1,2841810

OpenSeadragon doesn't have a flag for that, but you can easily build it using the MouseTracker. Here's an example (coded from memory and not tested, but it should give you the idea).

var drag;



var mouseTracker = new OpenSeadragon.MouseTracker({

  element: viewer.container, 

  nonPrimaryPressHandler: function(event) {

    if (event.button === 1) { // Middle

      drag = { 

        lastPos: event.position.clone()

      };

    }

  },

  moveHandler: function(event) {

    if (drag) {

      var deltaPixels = drag.lastPos.minus(event.position);

      var deltaPoints = viewer.viewport.deltaPointsFromPixels(deltaPixels);

      viewer.viewport.panBy(deltaPoints);

      drag.lastPos = event.position.clone();

    }

  },

  nonPrimaryReleaseHandler: function(event) {

    if (event.button === 1) {

      drag = null;

    }

  }

});

EDIT: I had a bug in the example code above; fixed.

edited Dec 11 '18 at 0:54

answered Nov 28 '18 at 18:23

iangilman

1,2841810

edited Dec 11 '18 at 0:54

answered Nov 28 '18 at 18:23

iangilman

1,2841810

answered Nov 28 '18 at 18:23

iangilman

1,2841810

answered Nov 28 '18 at 18:23

iangilman

1,2841810

I am able to drag the canvas with mouse middle wheel button but canvas movement is very fast.

– Fateh
Dec 6 '18 at 12:58

Here is the plunker: plnkr.co/edit/t5kUse2ztmdyoDKTyAjZ?p=preview

– Fateh
Dec 6 '18 at 15:03

I see! I made the mistake in my first example of converting the position to viewport coordinates too soon; the fact that the viewport was moving around caused the points to be inaccurate. I'm now saving the position in web coordinates and converting to viewport at the last minute, which creates the right result. I also had the minus backward so it was going in the wrong direction. Let me know if this works now!

– iangilman
Dec 11 '18 at 0:57

yes, now it's perfect.

– Fateh
Dec 13 '18 at 12:02

Excellent; glad to hear it! :)

– iangilman
Dec 13 '18 at 17:35

add a comment |

I am able to drag the canvas with mouse middle wheel button but canvas movement is very fast.

– Fateh
Dec 6 '18 at 12:58

Here is the plunker: plnkr.co/edit/t5kUse2ztmdyoDKTyAjZ?p=preview

– Fateh
Dec 6 '18 at 15:03

I see! I made the mistake in my first example of converting the position to viewport coordinates too soon; the fact that the viewport was moving around caused the points to be inaccurate. I'm now saving the position in web coordinates and converting to viewport at the last minute, which creates the right result. I also had the minus backward so it was going in the wrong direction. Let me know if this works now!

– iangilman
Dec 11 '18 at 0:57

yes, now it's perfect.

– Fateh
Dec 13 '18 at 12:02

Excellent; glad to hear it! :)

– iangilman
Dec 13 '18 at 17:35

I am able to drag the canvas with mouse middle wheel button but canvas movement is very fast.

– Fateh
Dec 6 '18 at 12:58

Here is the plunker: plnkr.co/edit/t5kUse2ztmdyoDKTyAjZ?p=preview

– Fateh
Dec 6 '18 at 15:03

I see! I made the mistake in my first example of converting the position to viewport coordinates too soon; the fact that the viewport was moving around caused the points to be inaccurate. I'm now saving the position in web coordinates and converting to viewport at the last minute, which creates the right result. I also had the minus backward so it was going in the wrong direction. Let me know if this works now!

– iangilman
Dec 11 '18 at 0:57

yes, now it's perfect.

– Fateh
Dec 13 '18 at 12:02

Excellent; glad to hear it! :)

– iangilman
Dec 13 '18 at 17:35

add a comment |

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