preview

Preview Xamarin Form Pages

由 安稳与你 提交于 2020-01-03 08:27:08
问题 Is there any way to preview a Xamarin forms page without first deploying to device/emulator? Or is there any way to live edit the page and see changes somewhere (a bit like Snoopy for WPF). I tried both Xamarin Studio + Visual Studio and do not see a designer. 回答1: Update 30 Sept 2016: Using the latest version of Xamarin you can use the following steps: Use the View > Other Windows > Xamarin.Forms Previewer menu in Visual Studio to open the preview window. Use the Window > New Vertical Tab

Using buddypress avatar upload and crop function on another bp page

由 三世轮回 提交于 2020-01-03 03:13:11
问题 Currently I am using BP Avatar to create user profile picture in the website. Now, I want to use the upload and crop + preview function of BP Avatar for another page and another image purpose with custom settings also. I have tried to copy and edit the code in the new page but it can't work, even the preview. Hope someone can help. Thankyou. 回答1: Here is the code. I detect the problems start when bbp not detect the user because in the bbp core they get the user id from url, and in my case

Android Resizing Camera Preview

由 梦想与她 提交于 2020-01-03 01:53:08
问题 Is there anyway to show the camera preview in an unsupported preview size? The app I'm making requires an image size of 800x480 but the preview needs to be 480x800. Is there anyway to do this? When I try changing the parameters the image gets squashed and stretched in the preview. 回答1: You can only use supported preview sizes. use: Parameters params = myCamera.getParameters(); List<Size> previewsizes = params.getSupportedPreviewSizes(); Pick a preview size that is the closest to what you want

GWT Event Preview vs Event Handler

由 会有一股神秘感。 提交于 2020-01-02 06:22:08
问题 My question is, what's the different between event preview and event handler in GWT. There is a callback function boolean onEventPreview(Event event) for event preview and a callback function void onBrowserEvent(Event event) as well. They are pretty similar, so what's the different between them? Especially when should I use the event preview at all when the event handler works perfect? thanks 回答1: DOM.addEventPreview(EventPreview preview) lets you place an event preview on top of the event

SurfaceView with camera preview is not destroyed

由 风格不统一 提交于 2020-01-01 10:48:12
问题 I have a Tab Activity with 2 tabs (activities). Each tab has a 3d Open GL scene drawn on top of a SurfaceView with camera preview. Yet, depending on device orientation, tabs are being switched. The problem is that when the other activity starts, it calls camera.open(), which generates exception, saying that camera service is unavailable. In fact, the problem is that camera is not stopped when activity is paused, in other words onSurfaceDestroyed() is not called for the SurfaceView. I tried to

Rails 3: best way to preview image before upload

由 家住魔仙堡 提交于 2019-12-30 04:02:14
问题 I need to preview an image prior to submitting a form. I work with Rails 3 and needs something that is browser compatible. Any ideas how I can achieve that? 回答1: So! :) The main idea is to use the FileReader Javascript Class, which is really handy for what you need to do. You just have to listen to the "change" event on your file input and then call a method that will use the "readAsDataURL()" method of the FileReader class. Then you just have to fill the source of a "preview img tag" with

How to handle autorotation in AVCaptureVideoPreviewLayer?

由 南笙酒味 提交于 2019-12-30 00:38:18
问题 My application supports all orientations except PortraitUpsideDown. In my view hierarchy I have an AVCaptureVideoPreviewLayer as a sublayer in the top view which is UIImageView. Then below it in view hierarchy are several overlay views showing controls. Overlay views are working properly with orientation changes, but I don't how to be with this AVCaptureVideoPreviewLayer. I want it to behave like in Camera app, so that previewLayer stays still and controls are smoothly reorganized. Right now

How can I set a website image that will show as preview on Facebook?

由 拜拜、爱过 提交于 2019-12-29 10:03:46
问题 When you share a link on facebook it will automatically find images on the website and randomly picks one as a preview. How can you influence the preview image? When a person shares the website link on his facebook? 回答1: 1. Include the Open Graph XML namespace extension to your HTML declaration <html xmlns="http://www.w3.org/1999/xhtml" xmlns:fb="http://ogp.me/ns/fb#"> 2. Inside your <head></head> use the following meta tag to define the image you want to use <meta property="og:image" content

Camera2 get continuous access to camera preview images

由 本秂侑毒 提交于 2019-12-29 07:13:22
问题 I want to extend an app from Camera1 to Camera2 depending on the API. One core mechanism of the app consists in taking preview pictures at a rate of about 20 pics per second. With Camera1 I realized that by creating a SurfaceView, adding a Callback on its holder and after creation of the surface accessing the preview pics via periodic setOneShotPreviewCallbacks. That was pretty easy and reliable. Now, when studying Camera2, I came "from the end" and managed to convert YUV420_888 to Bitmap

Invisible SurfaceView for Camera Preview

由 允我心安 提交于 2019-12-29 06:54:16
问题 I need to get camera preview data only, but not visible preview. Since I'm doing all this in a service, I had to create a dummy SurfaceView, which works very well. I've used the code from this answer: https://stackoverflow.com/a/10268650/1395697 However, with TYPE_SYSTEM_OVERLAY it didn't work. It was invisible but no preview data was received (in onPreviewFrame() ). When I change this argument to 0, I get preview data, but the SurfaceView is visible. Do you know any other way to do this?
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