Page and job setup dialogs remember latest settings. Simplified creation of a libprint printer driver. The printer add-on hook functions are implemented here. The libprint printer driver has to implement the function instantiate_printer_driver() where it creates an object of an inherited class from class PrinterDriver.

git-svn-id: file:///srv/svn/repos/haiku/trunk/current@6577 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/add-ons/print/drivers/shared/libprint/PrinterDriver.cpp

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+/*
+ * PrinterDriver.cpp
+ * Copyright 1999-2000 Y.Takagi. All Rights Reserved.
+ * Copyright 2004 Michael Pfeiffer.
+ */
+
+#include "PrinterDriver.h"
+
+#include <fs_attr.h> // for attr_info
+#include <File.h>
+#include <Message.h>
+#include <Node.h>
+#include <String.h>
+#include <memory> // for auto_ptr
+
+#include "BeUtils.h"
+#include "AboutBox.h"
+#include "DbgMsg.h"
+#include "Exports.h"
+#include "GraphicsDriver.h"
+#include "PrinterCap.h"
+#include "PrinterData.h"
+#include "UIDriver.h"
+
+
+// Implementation of PrinterDriver
+
+PrinterDriver::PrinterDriver(BNode* spoolFolder)
+	: fSpoolFolder(spoolFolder)
+	, fPrinterCap(NULL)
+	, fGraphicsDriver(NULL)
+{
+}
+
+PrinterDriver::~PrinterDriver() 
+{
+	delete fGraphicsDriver;
+	fGraphicsDriver = NULL;
+	
+	delete fPrinterCap;
+	fPrinterCap = NULL;
+}
+
+void PrinterDriver::About() 
+{
+	BString copyright;
+	copyright = "libprint Copyright © 1999-2000 Y.Takagi\n";
+	copyright << GetCopyright();
+	copyright << "All Rights Reserved.";
+	
+	AboutBox app(GetSignature(), GetDriverName(), GetVersion(), copyright.String());
+	app.Run();
+}
+
+char* PrinterDriver::AddPrinter(char* printerName)
+{
+	DBGMSG((">%s: add_printer\n", GetDriverName()));
+	DBGMSG(("\tprinter_name: %s\n", printerName));
+	DBGMSG(("<%s: add_printer\n", GetDriverName()));
+	return printerName;
+}
+
+BMessage* PrinterDriver::ConfigPage(BMessage* settings)
+{
+	DBGMSG((">%s: config_page\n", GetDriverName()));
+	DUMP_BMESSAGE(settings);
+	DUMP_BNODE(fSpoolFolder);
+	
+	BMessage pageSettings(*settings);
+	MergeWithPreviousSettings(kAttrPageSettings, &pageSettings);
+	PrinterData printerData(fSpoolFolder);
+	fPrinterCap = InstantiatePrinterCap(&printerData);
+	UIDriver drv(&pageSettings, &printerData, fPrinterCap);
+	BMessage *result = drv.configPage();
+	WriteSettings(kAttrPageSettings, result);
+
+	DUMP_BMESSAGE(result);
+	DBGMSG(("<%s: config_page\n", GetDriverName()));
+	return result;
+}
+
+BMessage* PrinterDriver::ConfigJob(BMessage* settings)
+{
+	DBGMSG((">%s: config_job\n", GetDriverName()));
+	DUMP_BMESSAGE(settings);
+	DUMP_BNODE(fSpoolFolder);
+	
+	BMessage jobSettings(*settings);
+	MergeWithPreviousSettings(kAttrJobSettings, &jobSettings);
+	PrinterData printerData(fSpoolFolder);
+	fPrinterCap = InstantiatePrinterCap(&printerData);
+	UIDriver drv(&jobSettings, &printerData, fPrinterCap);
+	BMessage *result = drv.configJob();
+	WriteSettings(kAttrJobSettings, result);
+	
+	DUMP_BMESSAGE(result);
+	DBGMSG(("<%s: config_job\n", GetDriverName()));
+	return result;
+}
+
+BMessage* PrinterDriver::TakeJob(BFile* printJob, BMessage* settings)
+{
+	DBGMSG((">%s: take_job\n", GetDriverName()));
+	DUMP_BMESSAGE(settings);
+	DUMP_BNODE(fSpoolFolder);
+
+	PrinterData printerData(fSpoolFolder);
+	fPrinterCap = InstantiatePrinterCap(&printerData);
+	fGraphicsDriver = InstantiateGraphicsDriver(settings, &printerData, fPrinterCap);
+	BMessage *result = fGraphicsDriver->takeJob(printJob);
+
+	DUMP_BMESSAGE(result);
+	DBGMSG(("<%s: take_job\n", GetDriverName()));
+	return result;
+}
+
+// read settings from spool folder attribute
+bool PrinterDriver::ReadSettings(const char* attrName, BMessage* settings)
+{
+	attr_info info;
+	char*  data;
+	ssize_t size;
+
+	settings->MakeEmpty();
+	
+	if (fSpoolFolder->GetAttrInfo(attrName, &info) == B_OK && info.size > 0) {
+		data = new char[info.size];
+		auto_ptr<char> _data(data);
+		size = fSpoolFolder->ReadAttr(attrName, B_MESSAGE_TYPE, 0, data, info.size);
+		if (size == info.size && settings->Unflatten(data) == B_OK) {
+			return true;
+		}
+	}
+	return false;
+}
+
+// write settings to spool folder attribute
+void PrinterDriver::WriteSettings(const char* attrName, BMessage* settings)
+{
+	if (settings == NULL || settings->what != 'okok') return;
+	
+	size_t size;
+	char* data;
+	
+	size = settings->FlattenedSize();
+	data = new char[size];
+	auto_ptr<char> _data(data);
+	
+	if (data != NULL && settings->Flatten(data, size) == B_OK) {
+		fSpoolFolder->WriteAttr(attrName, B_MESSAGE_TYPE, 0, data, size);
+	}
+}
+
+// read settings from spool folder attribute and merge them to current settings
+void PrinterDriver::MergeWithPreviousSettings(const char* attrName, BMessage* settings)
+{
+	if (settings == NULL) return;
+	
+	BMessage stored;
+	if (ReadSettings(attrName, &stored)) {
+		AddFields(&stored, settings);
+		*settings = stored;
+	}
+}
+
+// Implementation of PrinterDriverInstance 
+
+class PrinterDriverInstance 
+{
+public:
+	PrinterDriverInstance(BNode* spoolFolder = NULL);
+	~PrinterDriverInstance();
+	PrinterDriver* GetPrinterDriver() { return fInstance; }
+
+private:
+	PrinterDriver* fInstance;
+};
+
+PrinterDriverInstance::PrinterDriverInstance(BNode* spoolFolder)
+{
+	fInstance = instantiate_printer_driver(spoolFolder);
+}
+
+PrinterDriverInstance::~PrinterDriverInstance()
+{
+	delete fInstance;
+	fInstance = NULL;
+}
+
+
+// printer driver add-on functions
+
+char *add_printer(char *printerName)
+{
+	PrinterDriverInstance instance;
+	return instance.GetPrinterDriver()->AddPrinter(printerName);
+}
+
+BMessage *config_page(BNode *spoolFolder, BMessage *settings)
+{
+	PrinterDriverInstance instance(spoolFolder);
+	return instance.GetPrinterDriver()->ConfigPage(settings);
+}
+
+BMessage *config_job(BNode *spoolFolder, BMessage *settings)
+{
+	PrinterDriverInstance instance(spoolFolder);
+	return instance.GetPrinterDriver()->ConfigJob(settings);
+}
+
+BMessage *take_job(BFile *printJob, BNode *spoolFolder, BMessage *settings)
+{
+	PrinterDriverInstance instance(spoolFolder);
+	return instance.GetPrinterDriver()->TakeJob(printJob, settings);
+}
+
+// main entry if printer driver is launched directly
+
+int main(int argc, char* argv[])
+{
+	PrinterDriverInstance instance;
+	instance.GetPrinterDriver()->About();
+	return 0;
+}