Android Question Issue with .GetContentHeight from the WebviewExtras and WebViewExtras2 library

Seneca · Jan 24, 2018

Hi,

I have been testing WebViewExtras and WebViewExtras2 to calculate the height of a WV and it occurs to me that the height is calculated correctly only if I execute it in Debug mode and I put a break point in the _pagefinished event (line #36 of the example). In "release" mode it is not calculated correctly.

How can I solve that?

Best regards.

Edit: I had forgotten to attach the file.

Erel · Jan 25, 2018

Try to add Sleep(100).

Seneca · Jan 25, 2018

Hi,

I still can't test this solution because I'm still working with v.6.5

I wanted to learn a little more before making a new subscription. I'll try it soon.

Thanks Erel.

Erel · Jan 25, 2018

You can instead use CallSubUtils or a timer to add a short delay.

Seneca · Jan 25, 2018

Hi,

I've done the test using B4A v.7.8 Trial and it works correctly.

Thanks Erel.

Seneca · Jan 25, 2018

CallSubUtils isn't an external library, right? It was implemented from version v.6.8

Is this correct?

DonManfred · Jan 25, 2018

Seneca said:
It was implemented from version v.6.8

before 6.8 you can use the Class

Seneca · Jan 26, 2018

DonManfred said:
before 6.8 you can use the Class

Perfect, the class works for me. I'll use it provisionally.

Thanks

Seneca · Jan 26, 2018

Hi,

I'm doing tests using Sleep (with v7.8 Trial) and now I've found a new issue. The height is only calculated correctly if the WV goes from a lower height to a higher height. But on the contrary it doesn't work.

Is it a bug?

Example:

B4X:

Sub Globals
    Dim label1 As Label
    Dim wvinfo As WebView
    Dim wveInfo As WebViewExtras
    Dim infoHTML As String
End Sub

Sub Activity_Create(FirstTime As Boolean)
    Activity.LoadLayout("webview1")
    wveInfo.Initialize (wvinfo)
    infoHTML = "<html><head><style>body {font-size: 18px;}</style></head><body>Initial text. Initial text. Initial text. Initial text.</body></html>"
    wvinfo.LoadHtml(infoHTML)
End Sub

Sub wvinfo_pagefinished (url As String)
    Sleep(100)
    label1.Text = "Height: " & wveInfo.GetContentHeight & " - Scale: " & wveInfo.GetScale
    wvinfo.Height = wveInfo.GetContentHeight * wveInfo.GetScale
End Sub

Sub Font22_Click
    infoHTML = "<html><head><style>body {font-size: 22px;}</style></head><body>In this Case the height of the WV increases. <b>It Is right.</b> In this Case the height of the WV increases. <b>It Is right.</b></body></html>"
    wvinfo.LoadHtml(infoHTML)
End Sub


Sub Font18_Click
    infoHTML = "<html><head><style>body {font-size: 18px;}</style></head><body>In this Case the height of the WV does Not decrease. <b>It Is incorrect.</b> In this Case the height of the WV does Not decrease. <b>It Is incorrect.</b></body></html>"
    wvinfo.LoadHtml(infoHTML)
End Sub

Erel · Jan 26, 2018

I've changed your code to:

B4X:

Sub Font18_Click
   wvinfo.Height = 20dip
   infoHTML = "<html><head><style>body {font-size: 18px;}</style></head><body>In this Case the height of the WV does Not decrease. <b>It Is incorrect.</b> In this Case the height of the WV does Not decrease. <b>It Is incorrect.</b></body></html>"
   wvinfo.LoadHtml(infoHTML)
End Sub

Seems to work properly.

Seneca · Jan 26, 2018

Hi,

This solution works, but visually it shows an undesirable effect.

As an alternative, it has occurred to me to use an auxiliary WV (out of the screen) to do the calculation.

B4X:

Sub Globals
    Dim label1 As Label
    Dim wvinfo As WebView
    Dim wvAux As WebView       'Is out of screen
    Dim wveInfo As WebViewExtras
    Dim infoHTML As String
End Sub

Sub Activity_Create(FirstTime As Boolean)
    Activity.LoadLayout("webview1")
    wvAux.Width = wvinfo.Width
    wveInfo.Initialize (wvAux)
    infoHTML = "<html><head><style>body {font-size: 18px;}</style></head><body>Initial text. Initial text. Initial text. Initial text.</body></html>"
    wvAux.LoadHtml(infoHTML)
End Sub

Sub wvAux_pagefinished (url As String)
    Sleep(100)
    label1.Text = "Height: " & wveInfo.GetContentHeight & " - Scale: " & wveInfo.GetScale
    wvinfo.Height = wveInfo.GetContentHeight * wveInfo.GetScale
    wvinfo.LoadHtml(infoHTML)
End Sub

Sub Font22_Click
    infoHTML = "<html><head><style>body {font-size: 22px;}</style></head><body>In this Case the height of the WV increases. <b>It Is right.</b> In this Case the height of the WV increases. <b>It Is right.</b></body></html>"
    wvAux.LoadHtml(infoHTML)
End Sub


Sub Font18_Click
    infoHTML = "<html><head><style>body {font-size: 18px;}</style></head><body>In this Case the height of the WV does Not decrease. <b>It Is incorrect.</b> In this Case the height of the WV does Not decrease. <b>It Is incorrect.</b></body></html>"
    wvAux.LoadHtml(infoHTML)
End Sub

Android Question Issue with .GetContentHeight from the WebviewExtras and WebViewExtras2 library

Seneca

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Attachments

Erel

B4X founder

Seneca

Active Member

Erel

B4X founder

Seneca

Active Member

Seneca

Active Member

DonManfred

Expert

Seneca

Active Member

Seneca

Active Member

Attachments

Erel

B4X founder

Seneca

Active Member

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