customizing PDFLayoutDual

customizing PDFLayoutDual 3 years 11 months ago #14994

luca.f Topic Author Offline User is blocked Posts: 93 Thank you received: 10	Dear user, this is only possible with a custom implementation. PDFLayoutDual is designed to work with horizontal scroll Verts and horzs parameters have to do with screen orientation.
	Please Log in or Create an account to join the conversation. Last edit: by luca.f.

customizing PDFLayoutDual 3 years 11 months ago #14995

radaee
Offline
Moderator
Posts: 1123
Thank you received: 73

public GLLayoutDual(Context context, int align, int scale_mode, boolean rtol, boolean horz_dual[], boolean vert_dual[])

horz_dual is dual pages in horizon screen orient.
vert_dual is dual pages in vertical screen orient.
for your case:
vert_dual = [true, true, true] can apply ||1|2||3|4||5|6||, when in vertical orient
horz_dual = [true, true, true] can apply ||1|2||3|4||5|6||, when in horizon orient
and following code to layout first page(cover) as single page, other pages layout in dual pages cell, in horzon orient.

horz_dual = new boolean[m_doc.GetPageCount()];
horz_dual[0] = false;
for(i =1; i < m_doc.GetPageCount(); i++) horz_dual[i] = true;

Please Log in or Create an account to join the conversation.

customizing PDFLayoutDual 3 years 11 months ago #14997

nermeen
Offline
Platinum Member
Posts: 962
Thank you received: 87

Global.def_view values:

/**
	 * default view:
	 * 0:vertical --> single page vertical scroll PDFLayoutVert(in GL mode GLLayoutVert)
	 * 1:horizontal --> continuous horizontal scroll PDFLayoutHorz(in GL mode GLLayoutHorz)
	 * 2:curl --> curl effect (non interactive) (Only GL mode GLLayoutCurl)
	 * 3:single --> single page horizontal scroll PDFLayoutDual (in GL mode GLLayoutDual)
	 * 4:SingleEx --> first page is single (cover) the rest is dual horizontal scroll PDFLayoutDual (in GL mode GLLayoutDual)
	 * 5:ReFlow --> reflow mode (Only GL mode GLLayoutReflow)
	 * 6:2 page in landscape --> dual pages horizontal scroll PDFLayoutDual (in GL mode GLLayoutDual)
	 */
	public static int def_view = 0;

So PDFDualLayout is a good starting point and you can take hints for vertical scroll also from PDFLayoutVert

Please Log in or Create an account to join the conversation.

customizing PDFLayoutDual 3 years 11 months ago #15009

arlomedia
Offline
Senior Member
Posts: 56
Thank you received: 1

Okay, I have it working the way I want. I'm posting my changes here in case it helps someone else, or in case you'd want to integrate this into the product. Rather than modifying dev_view=6, I created a new def_view=100 to avoid conflicts with future versions.

Class: PDFLayoutView
Method: PDFSetView
Line in method: 38

Add this case statement:

case 100: {
	// arlo added: don't let the first page appear alone in either orientation
	PDFLayoutDual layout = new PDFLayoutDual(getContext());
	boolean paras[] = new boolean[m_doc.GetPageCount()];
	int cur = 0;
	while (cur < paras.length) {
		paras[cur] = true;
		cur++;
	}
	layout.vSetLayoutPara(paras, paras, Global.rtol, false);
	m_layout = layout;
}

Class: PDFViewDual
Method: vOnFling
Line in method: 8

Change "Global.def_view == 6" to "(Global.def_view == 6 || Global.def_view == 100)"

Class: PDFLayoutDual
Method: (class definition)
Line in method: 9

Add these two lines to the forward class declaration for PDFCell:

public int top;
public int bottom;

Class: PDFLayoutDual
Method: vLayout
Line in method: 11

Replace "if( m_h > m_w )" with "if ((Global.def_view != 100)&&( m_h > m_w ))" because I want to always use two columns, even with a portrait-oriented viewer.

Then go to the "else" section of that condition and replace the entire block with:

while( pcur < pcnt )
{
	// arlo comment: this section gets the width and height of each pair of pages
	if( (m_horz_dual == null || ccnt >= m_horz_dual.length/* || m_horz_dual[ccnt]*/) && pcur == 0 )
	{
		// arlo comment: first page if it appears alone; we're avoiding this by setting horzs in vSetLayoutPara
		float w = m_doc.GetPageWidth(pcur);
		if( max_w < w ) max_w = w;
		float h = m_doc.GetPageHeight(pcur);
		if( max_h < h ) max_h = h;
		if(Global.fit_different_page_size && m_scales[pcur] == 0) {
			m_scales[pcur] = ((float)(m_h - m_page_gap)) / h;
			m_scales_min[pcur] = ((float)(m_h - m_page_gap)) / h;
		}
		pcur++;
	}
	else
	if( (m_horz_dual == null || ccnt >= m_horz_dual.length || m_horz_dual[ccnt]) && pcur < pcnt - 1 )
	{
		// arlo comment: pairs of pages
		float w = m_doc.GetPageWidth(pcur) + m_doc.GetPageWidth(pcur + 1);
		if( max_w < w ) max_w = w;
		float h = m_doc.GetPageHeight(pcur);
		if( max_h < h ) max_h = h;
		h = m_doc.GetPageHeight(pcur + 1);
		if( max_h < h ) max_h = h;
		if(Global.fit_different_page_size && m_scales[pcur] == 0) {
			float minScale = (m_w - m_page_gap) / w;
			float scale = ((float)(m_h - m_page_gap)) / m_doc.GetPageHeight(pcur);
			if( minScale > scale ) minScale = scale;
			m_scales[pcur] = minScale;
			m_scales_min[pcur] = minScale;

			scale = ((float)(m_h - m_page_gap)) / m_doc.GetPageHeight(pcur + 1);
			if( minScale > scale ) minScale = scale;
			m_scales[pcur + 1] = minScale;
			m_scales_min[pcur + 1] = minScale;
		}
		pcur += 2;
	}
	else
	{
		// arlo comment: last page if it appears alone
		float w = m_doc.GetPageWidth(pcur);
		if( max_w < w ) max_w = w;
		float h = m_doc.GetPageHeight(pcur);
		if( max_h < h ) max_h = h;
		if(Global.fit_different_page_size && m_scales[pcur] == 0) {
			m_scales[pcur] = ((float)(m_h - m_page_gap)) / h;
			m_scales_min[pcur] = ((float)(m_h - m_page_gap)) / h;
		}
		pcur++;
	}
	ccnt++;
}
m_scale_min = ((float) (m_w - m_page_gap)) / max_w;
if (Global.def_view != 100) {
	// arlo removed: don't fit to height because I'm handling that outside the viewer; other people will probably want to leave this as it was
	float scale = ((float)(m_h - m_page_gap)) / max_h;
	if( m_scale_min > scale ) m_scale_min = scale;
}
m_scale_max = m_scale_min * m_zoom_level;
if( m_scale < m_scale_min ) m_scale = m_scale_min;
if( m_scale > m_scale_max ) m_scale = m_scale_max;
boolean clip = m_scale / m_scale_min > m_zoom_level_clip;
if (Global.def_view == 100) {
	// arlo added: set the total size of the static dimension
	m_tw = Global.fit_different_page_size && vGetScale() == vGetMinScale() ? m_w : (int) (max_w * m_scale) + m_page_gap;
} else {
	m_th = Global.fit_different_page_size && vGetScale() == vGetMinScale() ? m_h : (int) (max_h * m_scale) + m_page_gap;
}
if (m_th < m_h) m_th = m_h;
m_cells = new PDFCell[ccnt];
pcur = 0;
ccur = 0;
int left = 0;
int top = 0; // arlo added
while( ccur < ccnt )
{
	PDFCell cell = new PDFCell();
	int w = 0;
	int h = 0;
	int cw = 0;
	int ch = 0;
	boolean clipPage = Global.fit_different_page_size ? m_scales[pcur] / m_scales_min[pcur] > m_zoom_level_clip : clip;
	float pageScale = Global.fit_different_page_size ? m_scales[pcur] : m_scale;
	if ((m_horz_dual == null || ccur >= m_horz_dual.length ) && pcur == 0 )
	{
		// arlo comment: position the first page if it appears alone; we're avoiding this by setting horzs in vSetLayoutPara
		w = (int)( m_doc.GetPageWidth(pcur) * pageScale );
		h = (int)( m_doc.GetPageHeight(pcur) * pageScale );
		if( w + m_page_gap < m_w ) cw = m_w;
		else cw = w + m_page_gap;
		if( h + m_page_gap < m_h ) ch = m_h;
		else ch = h + m_page_gap;
		cell.page_left = pcur;
		cell.page_right = -1;
		cell.left = left;
		cell.right = left + cw;
		cell.top = top; // arlo added
		cell.bottom = top + ch; // arlo added
		if(m_page_align_top)
		{
			m_pages[pcur].vLayout(left + (cw - w) / 2, m_page_gap / 2, pageScale, clipPage);
		}
		else {
			if (Global.def_view == 100) {
				// arlo added
				m_pages[pcur].vLayout(left + (cw - w) / 2, top + (ch - h) / 2, pageScale, clipPage);
			} else {
				m_pages[pcur].vLayout(left + (cw - w) / 2, (int) (m_th - m_doc.GetPageHeight(pcur) * pageScale) / 2, pageScale, clipPage);
			}
		}
		pcur++;
	}
	else if( (m_horz_dual == null || ccur >= m_horz_dual.length || m_horz_dual[ccur]) && pcur < pcnt - 1 )
	{
		// arlo comment: position pairs of pages
		float pageScale2 = Global.fit_different_page_size ? m_scales[pcur + 1] : m_scale;
		w = Global.fit_different_page_size ? (int)( (m_doc.GetPageWidth(pcur) * pageScale) + (m_doc.GetPageWidth(pcur + 1)
				* pageScale2)) : (int)( (m_doc.GetPageWidth(pcur) + m_doc.GetPageWidth(pcur + 1)) * pageScale);
		h = Global.fit_different_page_size ? (int)( Math.max((m_doc.GetPageHeight(pcur) * pageScale), (m_doc.GetPageHeight(pcur + 1)
				* pageScale2)) ) : (int)( Math.max((m_doc.GetPageHeight(pcur) * pageScale), (m_doc.GetPageHeight(pcur + 1) * pageScale)) );
		if( w + m_page_gap < m_w ) cw = m_w;
		else cw = w + m_page_gap;
		if( h + m_page_gap < m_h ) ch = m_h;
		else ch = h + m_page_gap;
		cell.page_left = pcur;
		cell.page_right = pcur + 1;
		cell.left = left + 10; // I have no idea why, but without the +10 here, only the middle cell appears
		cell.right = left + cw - 10; // ditto
		cell.top = top; // arlo added
		cell.bottom = top + ch; // arlo added
		if(m_page_align_top)
		{
			m_pages[pcur].vLayout(left + (cw - w) / 2, m_page_gap / 2, pageScale, clip);
			m_pages[pcur + 1].vLayout(m_pages[pcur].GetX() + m_pages[pcur].GetWidth(), m_page_gap / 2, pageScale2, clip);
		}
		else {
			if (Global.def_view == 100) {
				// arlo added
				m_pages[pcur].vLayout(left + (cw - w) / 2, top + (ch - h) / 2, pageScale, clip);
				m_pages[pcur + 1].vLayout(m_pages[pcur].GetX() + m_pages[pcur].GetWidth(), top + (ch - h) / 2, pageScale2, clip);
			} else {
				m_pages[pcur].vLayout(left + (cw - w) / 2, (int) (m_th - m_doc.GetPageHeight(pcur) * pageScale) / 2, pageScale, clip);
				m_pages[pcur + 1].vLayout(m_pages[pcur].GetX() + m_pages[pcur].GetWidth(), (int) (m_th - m_doc.GetPageHeight(pcur + 1) * pageScale2) / 2, pageScale2, clip);
			}
		}
		pcur += 2;
	}
	else
	{
		// arlo comment: position the last page if it appears alone
		w = (int)( m_doc.GetPageWidth(pcur) * pageScale );
		h = (int)( m_doc.GetPageHeight(pcur) * pageScale );
		if( w + m_page_gap < m_w ) cw = m_w;
		else cw = w + m_page_gap;
		if( h + m_page_gap < m_h ) ch = m_h;
		else ch = h + m_page_gap;
		cell.page_left = pcur;
		cell.page_right = -1;
		cell.left = left;
		cell.right = left + cw;
		cell.top = top; // arlo added
		cell.bottom = top + ch; // arlo added
		if(m_page_align_top)
		{
			m_pages[pcur].vLayout(left + (cw - w) / 2, m_page_gap / 2, pageScale, clipPage);
		}
		else {
			if (Global.def_view == 100) {
				// arlo added
				m_pages[pcur].vLayout(left + (cw - w) / 2, top + (ch - h) / 2, pageScale, clipPage);
			} else {
				m_pages[pcur].vLayout(left + (cw - w) / 2, (int) (m_th - m_doc.GetPageHeight(pcur) * pageScale) / 2, pageScale, clipPage);
			}
		}
		pcur++;
	}
	if (Global.def_view == 100) {
		// arlo added
		top += ch;
	} else {
		left += cw;
	}
	m_cells[ccur] = cell;
	ccur++;
}
if (Global.def_view == 100) {
	// arlo added: set the total size of the scrolling dimension
	m_th = top;
} else {
	m_tw = left;
}

Here's a screen recording showing how it works:

Please Log in or Create an account to join the conversation.

customizing PDFLayoutDual 3 years 9 months ago #15136

rohitgarg2990 Offline New Member Posts: 17 Thank you received: 0	Hi @arlomedia, did you manage to make the vertical pagewise scroll not the continuous one?
	Please Log in or Create an account to join the conversation.

customizing PDFLayoutDual 3 years 9 months ago #15155

arlomedia
Offline
Senior Member
Posts: 56
Thank you received: 1

Yes, in fact I only allow full-page jumps rather than scrolling when using this 2-column layout. I added this customization to PDFLayout.java to do the page jumping:

// arlo added animated option
public void vSetPos(int vx, int vy, PDFPos pos) {
	vSetPos(vx, vy, pos, false);
}
public void vSetPos(int vx, int vy, PDFPos pos, boolean animated) {
	if (pos == null) return;
	if ((pos.pageno < 0)||(pos.pageno > m_pages.length - 1)) return; // arlo added this check
	VPage vpage = m_pages[pos.pageno];
	if (Global.def_view == 100) {
		// arlo replaced GetVX to scroll vertically with 2-up layouts, since the GetVX method source isn't available
		int x = Math.round(pos.x);
		int y = (int)Math.floor(pos.pageno / 2) * vpage.GetHeight(); // this assumes all pages are the same size
		vSetX(x - vx, animated);
		vSetY(y - vy, animated);
	} else {
		vSetX(vpage.GetVX(pos.x) - vx, animated);
		vSetY(vpage.GetVY(pos.y) - vy, animated);
	}
}

To disable scrolling, I added this to PDFLayoutView.java:

private boolean scrollEnabled = true;
public void setScrollEnabled(boolean enabled) {
	this.scrollEnabled = enabled;
}
public boolean isScrollEnabled() {
	return this.scrollEnabled;
}

Then in the onFling and onTouchNone methods of that class, I added:

if (!scrollEnabled) return false; // arlo added

Please Log in or Create an account to join the conversation.

TOPIC:

customizing PDFLayoutDual 3 years 11 months ago #14994

customizing PDFLayoutDual 3 years 11 months ago #14995

customizing PDFLayoutDual 3 years 11 months ago #14997

customizing PDFLayoutDual 3 years 11 months ago #15009

customizing PDFLayoutDual 3 years 9 months ago #15136

customizing PDFLayoutDual 3 years 9 months ago #15155