Actually they are not many text boxes. If you use the tool Spy++ that
you can launch from inside Visual Studio, you will see that there are only
a few controls inside Word. It is easier to see in the Windows accessory
called WordPad.
Or in Windows Paint, even if the image is much more larger than the
screen, the drawing area is just the size available at the dialog.
What is scrolled is the control contents, not the controls inside a big
scrolling control. Although the approach you suggest is possible, I haven't
seen applications that use it.
For example, do you know the Visio graphical editor? It has many visual
elements inside the drawing area, but they are not controls. If the user
start editing one the elements, then it will show a control just on that
area, much like the IupMatrix editing works.
In IupMatrix each cell can be edited but there aren't hundreds of IupText
along the matrix, we just need one when the user double clicks a cell to
start editing it. You will see the same in Excel.
If you don't feel comfortable in talking about your application in the
list you can send me a private message. But even if I improve the scrollbar
in IUP I think you will have more problems in the future with this approach.
Best,
Scuri
On Tue, Dec 2, 2014 at 1:21 PM, Milind Gupta <[email protected]> wrote:
> Hi Antonio,
> Thanks for your response. Let us consider a GUI design problem
> that we can relate to. Suppose we have to design Microsoft Word clone in
> IUP, lets say like a copy of libre office writer. Let us just concentrate
> on the page display panel for now. We know the whole thing is not just 1
> text box nor even 1 rich text box since it must accommodate the beginnings
> and endings of the pages and other type of elements that can be created
> like word art.
> So it is a collection of many different boxes. Let us take
> the case of many text boxes. We don't know the size of any text box before
> hand since their sizes depend on the content they hold, page size and the
> page zoom level.
> How would we implement such a UI? The only way I understood
> was to have them in a scroll box. I don't see any way so that I can just
> show a portion of a text box which is how word shows it depending on the
> scroll position.
>
> Another thing is that I made a sample script in wxLua to create
> a large scroll box window. I have attached the script (it requires wx.dll
> to run, the one from Lua For Windows or LuaDist should work). The scrolled
> window here does not get stuck as we saw in the iupscrollbox test case.
> Since wxWidgets also implements native controls I think probably
> iupscrollbox is missing some property setting or something that is limiting
> the scroll box action and getting stuck in the scrolling? In wxLua I did
> reach a text box size limit of around 32000 so I had to stack 2 text boxes
> to test the scroll box. But the scroll box there seems to be working good
> right till the end for even larger sizes.
>
> Thanks,
> Milind
>
> On Tue, Dec 2, 2014 at 3:47 AM, Antonio Scuri <[email protected]>
> wrote:
>
>> I think that in any GUI toolkit the solution wouldn't involve creating
>> a control with size 1131x8581.
>>
>> I don't know any application that does that. Usually the controls will
>> use the size available on screen and internally implement a virtual space
>> that can be incrementally navigated.
>>
>> Why do you need such a space?
>>
>> Best,
>> Scuri
>>
>>
>> On Mon, Dec 1, 2014 at 10:55 PM, Milind Gupta <[email protected]>
>> wrote:
>>
>>> Actually my problem is that the custom control I was trying to create
>>> using iupglcanvas is not possible with this limitation. I need to have a
>>> composition of controls like the text boxes, images, etc. on the canvas and
>>> scroll them. I am unable to find a solution to scroll these controls. Just
>>> the glcanvas scrolling also seems to behave weirdly when I just use the
>>> canvas scroll bar instead of a scroll box: it does not scroll the controls
>>> in the canvas box, just the canvas and if the canvasbox is large the
>>> canvasbox scrollbar somehow does not allow the mouse cursor over the scroll
>>> bar. As soon as the mouse goes over it the whole screen goes black and when
>>> it comes back the mouse cursor is on the center of the canvas rather than
>>> the scroll bar (attached script shows this issue). Also the scroll bar dx
>>> is not correct.
>>>
>>> Any suggestions how I can implement this type of UI using IUP? I am
>>> trying to implement a test case using wxLua so we can compare IUP scrolling
>>> script with wxLua since both use native controls.
>>>
>>> Milind
>>>
>>> On Mon, Dec 1, 2014 at 4:12 PM, Antonio Scuri <[email protected]>
>>> wrote:
>>>
>>>> I think you should let the IupText do its job. As long as text is
>>>> being added to it it will program and expand its own scrollbar. The chances
>>>> that internally would overcame this limitation are much more possible.
>>>>
>>>> Best,
>>>> Scuri
>>>>
>>>>
>>>> On Mon, Dec 1, 2014 at 8:39 PM, Milind Gupta <[email protected]>
>>>> wrote:
>>>>
>>>>> Thanks for looking into this. I am curious how do programs get around
>>>>> this. For example Microsoft word can have a document with 100s of pages
>>>>> and
>>>>> it is still able to scroll to all of them. Same for say notepad. Do you
>>>>> know how to get around the limitation?
>>>>>
>>>>> Thanks,
>>>>> Milind
>>>>>
>>>>> On Mon, Dec 1, 2014 at 2:23 PM, Antonio Scuri <
>>>>> [email protected]> wrote:
>>>>>
>>>>>> It is a system limitation. Your control is too big and although its
>>>>>> size is correct, the windows scrollbar has some limitation that prevents
>>>>>> the scrollbox to work.
>>>>>>
>>>>>> This code:
>>>>>>
>>>>>> tb1 = iup.text{rastersize = "1131x8581",multiline="YES"}
>>>>>>
>>>>>> sb = iup.scrollbox{
>>>>>> tb1
>>>>>> }
>>>>>> dlg = iup.dialog{
>>>>>> sb;
>>>>>> title="Dialog"
>>>>>> }
>>>>>> dlg:show()
>>>>>>
>>>>>> Works ok. But if you change 8581 to 38581 it will crop the visible
>>>>>> area.
>>>>>>
>>>>>> Best,
>>>>>> Scuri
>>>>>>
>>>>>>
>>>>>> On Fri, Nov 28, 2014 at 6:44 PM, Milind Gupta <[email protected]
>>>>>> > wrote:
>>>>>>
>>>>>>> I modified the test case to just have a text box instead of the
>>>>>>> canvas. After pasting a large text chunk in the text box it is more
>>>>>>> easily
>>>>>>> visible that the scroll box actually stops scrolling after the scroll
>>>>>>> thumb
>>>>>>> is about 9/10th of all the way down. Is this a limitation of the scroll
>>>>>>> box
>>>>>>> or is this a bug?
>>>>>>>
>>>>>>> Thanks,
>>>>>>> Milind
>>>>>>>
>>>>>>>
>>>>>>> On Fri, Nov 28, 2014 at 10:48 AM, Milind Gupta <
>>>>>>> [email protected]> wrote:
>>>>>>>
>>>>>>>> Hi,
>>>>>>>> I have attached a test case which on my system stops
>>>>>>>> generating the canvas action call back when the scroll box is about
>>>>>>>> 9/10
>>>>>>>> ths of all the way down.
>>>>>>>> Please let me know if I am doing something wrong or is there
>>>>>>>> a limitation on scroll box or the canvas in any way.
>>>>>>>>
>>>>>>>> Thanks,
>>>>>>>> Milind
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>
>>>>>>>
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